2023-24 Courses
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Independent Studies (3)
- Independent Research and Study
PHYSICS 190 (Aut, Win) - Research
PHYSICS 490 (Aut, Win, Spr, Sum) - Senior Thesis Research
PHYSICS 205 (Aut, Win, Spr)
- Independent Research and Study
All Publications
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Uniting the Sun's Hale magnetic cycle and "extended solar cycle" paradigms
FRONTIERS IN ASTRONOMY AND SPACE SCIENCES
2022; 9
View details for DOI 10.3389/fspas.2022.923049
View details for Web of Science ID 000880783600001
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Solar Toroidal Field Evolution Spanning Four Sunspot Cycles Seen by the Wilcox Solar Observatory, the Solar and Heliospheric Observatory/Michelson Doppler Imager, and the Solar Dynamics Observatory/Helioseismic and Magnetic Imager
ASTROPHYSICAL JOURNAL LETTERS
2022; 927 (1)
View details for DOI 10.3847/2041-8213/ac52ae
View details for Web of Science ID 000762053800001
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A Method for the Estimation of f- and p-mode Parameters and Rotational Splitting Coefficients from Un-averaged Solar Oscillation Power Spectra
ASTROPHYSICAL JOURNAL
2020; 894 (1)
View details for DOI 10.3847/1538-4357/ab7a17
View details for Web of Science ID 000533324600001
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A Critical Evaluation of Recent Claims Concerning Solar Rotation
ASTROPHYSICAL JOURNAL
2019; 877 (1)
View details for DOI 10.3847/1538-4357/ab13ad
View details for Web of Science ID 000468874600010
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Statistical Analysis of Acoustic Wave Power and Flows around Solar Active Regions
ASTROPHYSICAL JOURNAL
2018; 859 (1)
View details for DOI 10.3847/1538-4357/aabba5
View details for Web of Science ID 000432456000007
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On-Orbit Performance of the Helioseismic and Magnetic Imager Instrument onboard the Solar Dynamics Observatory
SOLAR PHYSICS
2018; 293 (3): 45
Abstract
The Helioseismic and Magnetic Imager (HMI) instrument is a major component of NASA's Solar Dynamics Observatory (SDO) spacecraft. Since commencement of full regular science operations on 1 May 2010, HMI has operated with remarkable continuity, e.g. during the more than five years of the SDO prime mission that ended 30 September 2015, HMI collected 98.4% of all possible 45-second velocity maps; minimizing gaps in these full-disk Dopplergrams is crucial for helioseismology. HMI velocity, intensity, and magnetic-field measurements are used in numerous investigations, so understanding the quality of the data is important. This article describes the calibration measurements used to track the performance of the HMI instrument, and it details trends in important instrument parameters during the prime mission. Regular calibration sequences provide information used to improve and update the calibration of HMI data. The set-point temperature of the instrument front window and optical bench is adjusted regularly to maintain instrument focus, and changes in the temperature-control scheme have been made to improve stability in the observable quantities. The exposure time has been changed to compensate for a 20% decrease in instrument throughput. Measurements of the performance of the shutter and tuning mechanisms show that they are aging as expected and continue to perform according to specification. Parameters of the tunable optical-filter elements are regularly adjusted to account for drifts in the central wavelength. Frequent measurements of changing CCD-camera characteristics, such as gain and flat field, are used to calibrate the observations. Infrequent expected events such as eclipses, transits, and spacecraft off-points interrupt regular instrument operations and provide the opportunity to perform additional calibration. Onboard instrument anomalies are rare and seem to occur quite uniformly in time. The instrument continues to perform very well.
View details for DOI 10.1007/s11207-018-1259-8
View details for Web of Science ID 000427695100004
View details for PubMedID 31007294
View details for PubMedCentralID PMC6445534
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STATISTICAL ANALYSIS OF ACOUSTIC WAVE PARAMETERS NEAR SOLAR ACTIVE REGIONS
ASTROPHYSICAL JOURNAL
2016; 827 (2)
View details for DOI 10.3847/0004-637X/827/2/140
View details for Web of Science ID 000384001600052
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Observables Processing for the Helioseismic and Magnetic Imager Instrument on the Solar Dynamics Observatory
SOLAR PHYSICS
2016; 291 (7): 1887-1938
View details for DOI 10.1007/s11207-016-0957-3
View details for Web of Science ID 000382094000001
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Helioseismology with Solar Orbiter
SPACE SCIENCE REVIEWS
2015; 196 (1-4): 251-283
View details for DOI 10.1007/s11214-014-0065-3
View details for Web of Science ID 000365755100010
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A METHOD FOR THE ESTIMATION OF p-MODE PARAMETERS FROM AVERAGED SOLAR OSCILLATION POWER SPECTRA
ASTROPHYSICAL JOURNAL
2015; 803 (2)
View details for DOI 10.1088/0004-637X/803/2/92
View details for Web of Science ID 000353524500044
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The Interface Region Imaging Spectrograph (IRIS)
SOLAR PHYSICS
2014; 289 (7): 2733-2779
View details for DOI 10.1007/s11207-014-0485-y
View details for Web of Science ID 000334201400020
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IDENTIFYING POTENTIAL MARKERS OF THE SUN'S GIANT CONVECTIVE SCALE
ASTROPHYSICAL JOURNAL LETTERS
2014; 784 (2)
View details for DOI 10.1088/2041-8205/784/2/L32
View details for Web of Science ID 000333333400015
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CHROMOSPHERIC AND CORONAL OBSERVATIONS OF SOLAR FLARES WITH THE HELIOSEISMIC AND MAGNETIC IMAGER
ASTROPHYSICAL JOURNAL LETTERS
2014; 780 (2)
View details for DOI 10.1088/2041-8205/780/2/L28
View details for Web of Science ID 000328993700014
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Far-side helioseismic maps: the next generation
IOP PUBLISHING LTD. 2013
View details for DOI 10.1088/1742-6596/440/1/012029
View details for Web of Science ID 000325951200029
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Perturbations in the wave parameters near active regions
IOP PUBLISHING LTD. 2013
View details for DOI 10.1088/1742-6596/440/1/012008
View details for Web of Science ID 000325951200008
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Comparison of Line-of-Sight Magnetograms Taken by the Solar Dynamics Observatory/Helioseismic and Magnetic Imager and Solar and Heliospheric Observatory/Michelson Doppler Imager
SOLAR PHYSICS
2012; 279 (1): 295-316
View details for DOI 10.1007/s11207-012-9976-x
View details for Web of Science ID 000305130700017
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Line-of-Sight Observables Algorithms for the Helioseismic and Magnetic Imager (HMI) Instrument Tested with Interferometric Bidimensional Spectrometer (IBIS) Observations
SOLAR PHYSICS
2012; 278 (1): 217-240
View details for DOI 10.1007/s11207-011-9927-y
View details for Web of Science ID 000303395600013
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A First Look at Magnetic Field Data Products from SDO/HMI
4th Hinode Science Meeting on Unsolved Problems and Recent Insights
ASTRONOMICAL SOC PACIFIC. 2012: 337–352
View details for Web of Science ID 000309734100032
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The Helioseismic and Magnetic Imager (HMI) Investigation for the Solar Dynamics Observatory (SDO)
SOLAR PHYSICS
2012; 275 (1-2): 207-227
View details for DOI 10.1007/s11207-011-9834-2
View details for Web of Science ID 000299294600010
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Time-Distance Helioseismology Data-Analysis Pipeline for Helioseismic and Magnetic Imager Onboard Solar Dynamics Observatory (SDO/HMI) and Its Initial Results
SOLAR PHYSICS
2012; 275 (1-2): 375-390
View details for DOI 10.1007/s11207-011-9757-y
View details for Web of Science ID 000299294600016
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Wavelength Dependence of the Helioseismic and Magnetic Imager (HMI) Instrument onboard the Solar Dynamics Observatory (SDO)
SOLAR PHYSICS
2012; 275 (1-2): 285-325
View details for DOI 10.1007/s11207-011-9723-8
View details for Web of Science ID 000299294600013
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Implementation and Comparison of Acoustic Travel-Time Measurement Procedures for the Solar Dynamics Observatory/Helioseismic and Magnetic Imager Time-Distance Helioseismology Pipeline
SOLAR PHYSICS
2012; 275 (1-2): 357-374
View details for DOI 10.1007/s11207-010-9652-y
View details for Web of Science ID 000299294600015
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Design and Ground Calibration of the Helioseismic and Magnetic Imager (HMI) Instrument on the Solar Dynamics Observatory (SDO)
SOLAR PHYSICS
2012; 275 (1-2): 229-259
View details for DOI 10.1007/s11207-011-9842-2
View details for Web of Science ID 000299294600011
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The Atmospheric Imaging Assembly (AIA) on the Solar Dynamics Observatory (SDO)
SOLAR PHYSICS
2012; 275 (1-2): 17-40
View details for DOI 10.1007/s11207-011-9776-8
View details for Web of Science ID 000299294600003
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Imaging Spectroscopy of a White-Light Solar Flare
SOLAR PHYSICS
2011; 269 (2): 269-281
View details for DOI 10.1007/s11207-010-9696-z
View details for Web of Science ID 000290451700003
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Temporal changes in the frequencies and widths of the solar p-mode oscillations
IOP PUBLISHING LTD. 2011
View details for DOI 10.1088/1742-6596/271/1/012029
View details for Web of Science ID 000294742700029
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Temporal changes in the frequencies of the solar p-mode oscillations during solar cycle 23
CAMBRIDGE UNIV PRESS. 2011: 389-393
View details for DOI 10.1017/S1743921311015614
View details for Web of Science ID 000304890800070
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On the success rate of the farside seismic imaging of active regions
SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS
2010; 8
View details for DOI 10.1029/2009SW000560
View details for Web of Science ID 000278740400002
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Three Cycles of the Solar Toroidal Magnetic Field and This Peculiar Minimum
SOHO-23 Workshop on Understanding a Peculiar Solar Minimum
ASTRONOMICAL SOC PACIFIC. 2010: 109–112
View details for Web of Science ID 000287834900015
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A NEW WAY TO INFER VARIATIONS OF THE SEISMIC SOLAR RADIUS
ASTROPHYSICAL JOURNAL LETTERS
2009; 691 (2): L87-L90
View details for DOI 10.1088/0004-637X/691/2/L87
View details for Web of Science ID 000263148800006
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Improving the Prediction Capability of Seismic Far-Side Maps
Workshop on Solar-Stellar Dynamos as Revealed by Helio and Asteroseismology (GONG 2008/SOHO 21)
ASTRONOMICAL SOC PACIFIC. 2009: 87–92
View details for Web of Science ID 000281240900012
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Distributing space weather monitoring instruments and educational materials worldwide for IHY 2007: The AWESOME and SID project
ADVANCES IN SPACE RESEARCH
2008; 42 (11): 1777-1785
View details for DOI 10.1016/j.asr.2007.12.013
View details for Web of Science ID 000261543500001
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A changing solar shape
ASTROPHYSICAL JOURNAL
2007; 660 (2): L161-L163
View details for Web of Science ID 000246574400021
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Analytical models for cross-correlation signal in time-distance helioseismology
ASTROPHYSICAL JOURNAL
2007; 659 (2): 1736-1748
View details for Web of Science ID 000245774700068
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A note on saturation seen in the MDI/SOHO magnetograms
SOLAR PHYSICS
2007; 241 (1): 185-193
View details for DOI 10.1007/s11207-007-0296-5
View details for Web of Science ID 000245503000015
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Radiative transfer effects on Doppler measurements as sources of surface effects in sunspot seismology
ASTROPHYSICAL JOURNAL
2007; 654 (2): L175-L178
View details for Web of Science ID 000243383000018
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Magnetic field vector retrieval with the helioseismic and magnetic imager
SOLAR PHYSICS
2007; 240 (1): 177-196
View details for DOI 10.1007/s11207-006-0219-x
View details for Web of Science ID 000244954600016
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Spectral line selection for HMI: A comparison of FeI 6173 angstrom and NiI 6768 angstrom
SOLAR PHYSICS
2006; 239 (1-2): 69-91
View details for DOI 10.1007/s11207-006-0279-y
View details for Web of Science ID 000242706500004
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Success rate of predicting the heliospheric magnetic field polarity with Michelson Doppler Imager (MDI) synoptic charts
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2006; 111 (A10)
View details for DOI 10.1029/2005JA011576
View details for Web of Science ID 000241701800001
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Spectral line selection for HMI
SOLAR POLARIZATION 4
2006; 358: 193-196
View details for Web of Science ID 000246255400036
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Magnetic field vector retrieval with HMI
SOLAR POLARIZATION 4
2006; 358: 144-147
View details for Web of Science ID 000246255400026
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Prediction and understanding of the north-south displacement of the heliospheric current sheet
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2005; 110 (A10)
View details for DOI 10.1029/2004JA010723
View details for Web of Science ID 000232512800001
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On the constancy of the solar diameter. II.
ASTROPHYSICAL JOURNAL
2004; 613 (2): 1241-1252
View details for Web of Science ID 000224303200048
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Optimal masks for solar g-mode detection
ASTROPHYSICAL JOURNAL
2003; 588 (2): 1199-1203
View details for Web of Science ID 000182991900045
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Effects of magnetic topology on CME kinematic properties
International Solar Cycle Studies Symposium (ISCS 2003)
ESA PUBLICATIONS DIVISION C/O ESTEC. 2003: 459–464
View details for Web of Science ID 000188242400082
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Solar mean magnetic field variability: A wavelet approach to Wilcox Solar Observatory and SOHO/Michelson Doppler Imager observations
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2002; 107 (A10)
View details for DOI 10.1029/2001JA009195
View details for Web of Science ID 000180353900053
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Large-scale solar coronal structures in soft X-rays and their relationship to the magnetic flux
ASTROPHYSICAL JOURNAL
2002; 571 (2): L181-L185
View details for Web of Science ID 000175831100025
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On formation of the sigmoidal structure in solar active region NOAA 8100
SOLAR PHYSICS
2002; 206 (2): 333-346
View details for Web of Science ID 000174933800009
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Optimal masks for g-mode detection in MDI velocity data
SOHO-11 Symposium on From Solar Min to Max
ESA PUBLICATIONS DIVISION C/O ESTEC. 2002: 115–118
View details for Web of Science ID 000177565200024
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Solar coronal activity and evolution of the magnetic field
SOLAR-TERRESTRIAL MAGNETIC ACTIVITY AND SPACE ENVIRONMENT
2002; 14: 27-31
View details for Web of Science ID 000181336400004
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Coronal patterns of activity from Yohkoh and SOHO/EIT data
Yohkoh 10th Anniversary Meeting on Multi-Wavelength Observations of Coronal Structure and Dynamics
PERGAMON-ELSEVIER SCIENCE LTD. 2002: 329–332
View details for Web of Science ID 000179468700086
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Effect of line asymmetry on determination of high-degree mode frequencies
SOHO-11 Symposium on From Solar Min to Max
ESA PUBLICATIONS DIVISION C/O ESTEC. 2002: 87–90
View details for Web of Science ID 000177565200017
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Large-scale coronal structures in EUV and soft X-rays in solar cycle 23
SOHO-11 Symposium on From Solar Min to Max
ESA PUBLICATIONS DIVISION C/O ESTEC. 2002: 367–370
View details for Web of Science ID 000177565200072
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Local-area helioseismology as a diagnostic tool for solar variability
E2 3/E2 4 Symposia of COSPAR Scientific Commission E held at the 33rd COSPAR Scientific Assembly
PERGAMON-ELSEVIER SCIENCE LTD. 2002: 1899–1910
View details for Web of Science ID 000177314700003
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Active longitudes and coronal structures during the rising phase of the solar cycle
E2 2/D2 2 Symposium of COSPAR Scientific Commission E held at the 33rd COSPAR Scientific Assembly
PERGAMON-ELSEVIER SCIENCE LTD. 2002: 389–94
View details for Web of Science ID 000174269800015
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Solar cycle in the photosphere and corona
10th European Solar Physics Meeting
EUROPEAN SPACE AGENCY. 2002: 831–834
View details for Web of Science ID 000181080400191
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A new method for measuring frequencies and splittings of high-degree modes
SOHO-11 Symposium on From Solar Min to Max
ESA PUBLICATIONS DIVISION C/O ESTEC. 2002: 91–94
View details for Web of Science ID 000177565200018
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Observed and predicted ratios of the horizontal and vertical components of the solar p-mode velocity eigenfunctions
ASTROPHYSICAL JOURNAL
2001; 561 (2): 1127-1143
View details for Web of Science ID 000172188800051
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Detection of high-latitude waves of solar coronal activity in extreme-ultraviolet data from the Solar and Heliospheric Observatory EUV Imaging Telescope
ASTROPHYSICAL JOURNAL
2001; 554 (1): L107-L110
View details for Web of Science ID 000169690900026
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Active longitudinal structures of the sun from MDI and EIT observations
24th General Assembly of the International-Astronomical-Union
ASTRONOMICAL SOC PACIFIC. 2001: 251–53
View details for Web of Science ID 000175997400050
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Local-area helioseismology by sot on-board SOLAR-B
SOHO 10/GONG 2000 Workshop on Helio- and Asteroseismology at the Dawn of the Millennium
ESA PUBLICATIONS DIVISION C/O ESTEC. 2001: 327–330
View details for Web of Science ID 000169104500064
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Large-scale patterns of solar magnetic field and activity cycles
MAGNETIC FIELDS ACROSS THE HERTZSPRUNG-RUSSELL DIAGRAM
2001; 248: 135-138
View details for Web of Science ID 000176291300016
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G-mode detection: Where do we stand?
SOHO 10/GONG 2000 Workshop on Helio- and Asteroseismology at the Dawn of the Millennium
ESA PUBLICATIONS DIVISION C/O ESTEC. 2001: 467–471
View details for Web of Science ID 000169104500093
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Heliotomography of the outer layers of the sun
SOHO 10/GONG 2000 Workshop on Helio- and Asteroseismology at the Dawn of the Millennium
ESA PUBLICATIONS DIVISION C/O ESTEC. 2001: 701–706
View details for Web of Science ID 000169104500140
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Time-distance helioseismology and the Solar Orbiter mission
1st Solar Orbiter Workshop
ESA PUBLICATIONS DIVISION C/O ESTEC. 2001: 227–231
View details for Web of Science ID 000173695900033
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MDI-SOHO measures of solar radius variation
24th General Assembly of the International-Astronomical-Union
ASTRONOMICAL SOC PACIFIC. 2001: 101–4
View details for Web of Science ID 000175997400015
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Probing magnetic structures in the solar interior by helioseismic tomography
Workshop on Magnetic Fields across the Hertzsprung-Russell Diagram
ASTRONOMICAL SOC PACIFIC. 2001: 169–172
View details for Web of Science ID 000176291300025
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On the constancy of the solar diameter
ASTROPHYSICAL JOURNAL
2000; 543 (2): 1007-1010
View details for Web of Science ID 000165599300044
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Modeling the 1994 April 14 polar crown SXR arcade using three-dimensional magnetohydrostatic equilibrium solutions
ASTROPHYSICAL JOURNAL
2000; 538 (2): 932-939
View details for Web of Science ID 000088824800048
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Observational upper limits to low-degree solar g-modes
ASTROPHYSICAL JOURNAL
2000; 538 (1): 401-414
View details for Web of Science ID 000088706000040
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Rossby waves on the Sun as revealed by solar 'hills'
NATURE
2000; 405 (6786): 544-546
Abstract
It is a long-standing puzzle that the Sun's photosphere--its visible surface--rotates differentially, with the equatorial regions rotating faster than the poles. It has been suggested that waves analogous to terrestrial Rossby waves, and known as r-mode oscillations, could explain the Sun's differential rotation: Rossby waves are seen in the oceans as large-scale (hundreds of kilometres) variations of sea-surface height (5-cm-high waves), which propagate slowly either east or west (they could take tens of years to cross the Pacific Ocean). Calculations show that the solar r-mode oscillations have properties that should be strongly constrained by differential rotation. Here we report the detection of 100-m-high 'hills' in the photosphere, spaced uniformly over the Sun's surface with a spacing of (8.7 +/- 0.6) x 10(4) km. If convection under the photosphere is organized by the r-modes, the observed corrugated photosphere is a probable surface manifestation of these solar oscillations.
View details for Web of Science ID 000087449500042
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Comparison of frequencies and rotational splittings of solar acoustic modes of low angular degree from simultaneous MDI and GOLF observations
ASTROPHYSICAL JOURNAL
2000; 535 (2): 1066-1077
View details for Web of Science ID 000087789500047
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The magnetic connectivity of moss regions
SOLAR PHYSICS
2000; 193 (1-2): 219-225
View details for Web of Science ID 000089357300014
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Time-distance inversion methods and results - (Invited review)
SOLAR PHYSICS
2000; 192 (1-2): 159-176
View details for Web of Science ID 000088224800010
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Structure and dynamics of interconnecting loops and coronal holes in active longitudes
SOLAR PHYSICS
1999; 190 (1-2): 145-151
View details for Web of Science ID 000087182100011
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Power spectra comparison between GOLF and spatially masked MDI velocity signals
ASTRONOMY & ASTROPHYSICS
1999; 348 (2): 627-635
View details for Web of Science ID 000082293000037
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The interaction of new and old magnetic fluxes at the beginning of solar cycle 23
ASTROPHYSICAL JOURNAL
1999; 517 (2): L163-L166
View details for Web of Science ID 000081012000023
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Changes of the boot-shaped coronal hole boundary during Whole Sun Month near sunspot minimum
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
1999; 104 (A5): 9735-9751
View details for Web of Science ID 000080058600008
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Time-distance helioseismology
HELIOSEISMOLOGY AND SOLAR VARIABILITY
1999; 24 (2): 163-171
View details for Web of Science ID 000083308300004
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Asymmetry and frequencies of low-degree p-modes and the structure of the Sun's core
ASTROPHYSICAL JOURNAL
1998; 506 (2): L147-L150
View details for Web of Science ID 000077779300016
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Helioseismic studies of differential rotation in the solar envelope by the solar oscillations investigation using the Michelson Doppler Imager
ASTROPHYSICAL JOURNAL
1998; 505 (1): 390-417
View details for Web of Science ID 000077777900035
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Long-lived giant cells detected at the surface of the Sun
NATURE
1998; 394 (6694): 653-655
View details for Web of Science ID 000075384200035
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Magnetic field of the Sun as a star: The Mount Wilson Observatory catalog 1970-1982
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
1998; 116 (1): 103-117
View details for Web of Science ID 000073691700006
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The Sun's shape and brightness
NATURE
1998; 392 (6672): 155-157
View details for Web of Science ID 000072462700053
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Asymmetry in velocity and intensity helioseismic spectra: A solution to a long-standing puzzle
ASTROPHYSICAL JOURNAL
1998; 495 (2): L115-L118
View details for Web of Science ID 000072714300012
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A new method for diagnostics of solar magnetic fields and flows from time-distance analysis
ASTROPHYSICAL JOURNAL
1998; 494 (1): 438-?
View details for Web of Science ID 000072155800036
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Calibration and stability of MDI velocities
SOHO 6/GONG 98 Workshop on Structure and Dynamics of the Interior of the Sun and Sun-Like Stars
EUROPEAN SPACE AGENCY. 1998: 105–108
View details for Web of Science ID 000078509100017
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APT: An astrometric and photometric telescope
Conference on the Missions to the Sun II
SPIE - INT SOC OPTICAL ENGINEERING. 1998: 203–209
View details for Web of Science ID 000078010300020
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Spherical and aspherical structure of the Sun: First year of SOHO/MDI observations
185th Symposium of the International-Astronomical-Union on New Eyes to See Inside the Sun and Stars
SPRINGER. 1998: 157–64
View details for Web of Science ID 000078932400033
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The detection of giant velocity cells on the sun
SOHO 6/GONG 98 Workshop on Structure and Dynamics of the Interior of the Sun and Sun-Like Stars
EUROPEAN SPACE AGENCY. 1998: 725–729
View details for Web of Science ID 000078509100135
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Time-distance measurements of subsurface rotation and meridional flow
SOHO 6/GONG 98 Workshop on Structure and Dynamics of the Interior of the Sun and Sun-Like Stars
EUROPEAN SPACE AGENCY. 1998: 775–780
View details for Web of Science ID 000078509100145
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Line asymmetry and excitation mechanism of solar oscillations
185th Symposium of the International-Astronomical-Union on New Eyes to See Inside the Sun and Stars
SPRINGER. 1998: 195–98
View details for Web of Science ID 000078932400045
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SOI/MDI: Status and future prospects
SOHO 6/GONG 98 Workshop on Structure and Dynamics of the Interior of the Sun and Sun-Like Stars
EUROPEAN SPACE AGENCY. 1998: 15–16
View details for Web of Science ID 000078509100004
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Helio-atmospheric links explorer (HALE): A MIDEX experiment for exploring the emergence of magnetic flux from below the solar photosphere through the corona
Conference on a Crossroads for European Solar and Heliospheric Physics
EUROPEAN SPACE AGENCY. 1998: 285–288
View details for Web of Science ID 000076481300039
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The Evershed effect: An MDI investigation
SOHO 6/GONG 98 Workshop on Structure and Dynamics of the Interior of the Sun and Sun-Like Stars
EUROPEAN SPACE AGENCY. 1998: 607–610
View details for Web of Science ID 000078509100113
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A subsurface flow of material from the Sun's equator to its poles
NATURE
1997; 390 (6655): 52-54
View details for Web of Science ID A1997YE47700046
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Tri-phonic helioseismology: Comparison of solar p modes observed by the helioseismology instruments aboard SOHO
SOLAR PHYSICS
1997; 175 (2): 311-328
View details for Web of Science ID 000071784300006
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Measurements of frequencies of solar oscillations from the MDI Medium-l Program
SOLAR PHYSICS
1997; 175 (2): 287-310
View details for Web of Science ID 000071784300005
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Structure and rotation of the solar interior: Initial results from the MDI medium-l program
SOLAR PHYSICS
1997; 170 (1): 43-61
View details for Web of Science ID A1997WP47400003
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Modeling boot-shaped coronal holes using SOHO-MDI magnetic measurements
5th SOHO Workshop on the Corona and Solar Wind Near Minimum Activity
EUROPEAN SPACE AGENCY. 1997: 751–755
View details for Web of Science ID 000071215200135
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Time-distance helioseismology with the MDI instrument: Initial results
SOLAR PHYSICS
1997; 170 (1): 63-73
View details for Web of Science ID A1997WP47400004
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Temporal variability in the quiet Sun transition region
5th SOHO Workshop on the Corona and Solar Wind Near Minimum Activity
EUROPEAN SPACE AGENCY. 1997: 733–738
View details for Web of Science ID 000071215200132
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The first results from SOHO
ESA BULLETIN-EUROPEAN SPACE AGENCY
1996: 7-24
View details for Web of Science ID A1996VH95900001
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Perspectives in helioseismology
SCIENCE
1996; 272 (5266): 1281-1283
Abstract
Helioseismology is probing the interior structure and dynamics of the sun with ever-increasing precision, providing a well-calibrated laboratory in which physical processes can be studied under conditions that are unattainable on Earth. Nearly 10 million resonant modes of oscillation are observable in the solar atmosphere, and their frequencies need to be known with great accuracy in order to gauge the sun's interior. The advent of nearly continuous imaged observations from the complementary ground-based Global Oscillation Network Group (GONG) observatories and the space-based Solar and Heliospheric Observatory instruments augurs a new era of discovery. The flow of early results from GONG resolves some issues and raises a number of theoretical questions whose answers are required for understanding how a seemingly ordinary star actually operates.
View details for Web of Science ID A1996UN47200030
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Prediction of coronal and heliospheric magnetic fields: The promise of SOI-MDI on SOHO
8th International Solar Wind Conference
AMER INST PHYSICS. 1996: 76–79
View details for Web of Science ID A1996BG73Q00016
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The solar chromospheric and coronal explorer
Conference on Missions to the Sun
SPIE - INT SOC OPTICAL ENGINEERING. 1996: 286–297
View details for Web of Science ID A1996BG93W00029
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The solar oscillations investigation - Michelson Doppler Imager
SOLAR PHYSICS
1995; 162 (1-2): 129-188
View details for Web of Science ID A1995TM50300007
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Status of Mt Wilson - Crimean-Kazakhstan high degree helioseismology network
2nd GONG Science Conference - Helio-Seismology and Astero-Seismology from the Earth and Space
ASTRONOMICAL SOC PACIFIC. 1995: 398–401
View details for Web of Science ID A1995BD96T00078
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Status of the Solar Oscillations Investigation - Michelson Doppler Imager
2nd GONG Science Conference - Helio-Seismology and Astero-Seismology from the Earth and Space
ASTRONOMICAL SOC PACIFIC. 1995: 402–407
View details for Web of Science ID A1995BD96T00079
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Michelson Doppler Imager (MDI) performance characteristics
2nd GONG Science Conference - Helio-Seismology and Astero-Seismology from the Earth and Space
ASTRONOMICAL SOC PACIFIC. 1995: 456–461
View details for Web of Science ID A1995BD96T00089
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EAST-WEST INCLINATION OF LARGE-SCALE PHOTOSPHERIC MAGNETIC-FIELDS
2nd Flares22 Workshop on Recent Observations and Theories of Solar Flares
SPRINGER. 1994: 131–41
View details for Web of Science ID A1994PQ77500009
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ON THE UPPER LIMIT FOR DETECTING G-MODE OSCILLATIONS OF THE SUN
Conference on GONG 1992: Seismic Investigation of the Sun and Stars
ASTRONOMICAL SOC PACIFIC. 1993: 281–284
View details for Web of Science ID A1993BA06G00059
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THE SEARCH FOR 160-MIN OSCILLATIONS IN THE STANFORD AND CRIMEAN SOLAR VELOCITY OBSERVATIONS, 1974-1991
Conference on GONG 1992: Seismic Investigation of the Sun and Stars
ASTRONOMICAL SOC PACIFIC. 1993: 293–296
View details for Web of Science ID A1993BA06G00062
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THE HIGH-FREQUENCY P-MODE SPECTRUM
Conference on GONG 1992: Seismic Investigation of the Sun and Stars
ASTRONOMICAL SOC PACIFIC. 1993: 97–100
View details for Web of Science ID A1993BA06G00018
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PLANS FOR MT-WILSON - CRIMEAN-OBSERVATORY HIGH-DEGREE HELIOSEISMOLOGY NETWORK
Conference on GONG 1992: Seismic Investigation of the Sun and Stars
ASTRONOMICAL SOC PACIFIC. 1993: 477–480
View details for Web of Science ID A1993BA06G00094
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OBSERVATIONS OF HIGH-FREQUENCY AND HIGH-WAVE-NUMBER SOLAR OSCILLATIONS
ASTROPHYSICAL JOURNAL
1992; 392 (2): 736-738
View details for Web of Science ID A1992HY14500040
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THE IRIS NETWORK SITE AT THE WILCOX SOLAR OBSERVATORY
2ND WORKSHOP OF THE INTERNATIONAL RESEARCH ON THE INTERIOR OF THE SUN ( IRIS )
SPRINGER. 1991: 57–59
View details for Web of Science ID A1991FL12800007
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THE SOLAR OSCILLATIONS INVESTIGATION - MICHELSON DOPPLER IMAGER FOR SOHO
MEETING OF THE INTERDISCIPLINARY SCIENTIFIC COMMISSION AT THE COSPAR 28TH PLENARY MEETING
PERGAMON PRESS LTD. 1991: 113–122
View details for Web of Science ID A1991BT22E00014
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ROTATION OF THE PHOTOSPHERIC MAGNETIC-FIELDS - A NORTH-SOUTH ASYMMETRY
ASTROPHYSICAL JOURNAL
1990; 360 (1): 296-304
View details for Web of Science ID A1990DV08900032
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SOLAR VARIABILITY INFLUENCES ON WEATHER AND CLIMATE - POSSIBLE CONNECTIONS THROUGH COSMIC-RAY FLUXES AND STORM INTENSIFICATION
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
1989; 94 (D12): 14783-14792
View details for Web of Science ID A1989AX37700016
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HELIOSEISMIC OBSERVATIONS AT STANFORD, 1977-1986
IAU SYMPOSIA
1988: 29-32
View details for Web of Science ID A1988L891900004
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ON THE FEASIBILITY OF CORRELATION TRACKING AT MODERATE RESOLUTION
SOLAR PHYSICS
1988; 116 (2): 205-214
View details for Web of Science ID A1988Q688500001
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ROTATION OF THE CORONAL MAGNETIC-FIELD
ASTROPHYSICAL JOURNAL
1987; 318 (1): 428-436
View details for Web of Science ID A1987H898800032
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AN ATLAS OF PHOTOSPHERIC MAGNETIC-FIELD OBSERVATIONS AND COMPUTED CORONAL MAGNETIC-FIELDS - 1976-1985
SOLAR PHYSICS
1986; 105 (1): 205-211
View details for Web of Science ID A1986D386400018
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THE INFLUENCE OF THE HELIOSPHERIC CURRENT SHEET AND ANGULAR SEPARATION ON FLARE-ACCELERATED SOLAR-WIND
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
1985; 90 (NA11): 1055-1061
View details for Web of Science ID A1985ATL1500027
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DETECTION OF SOLAR GRAVITY MODE OSCILLATIONS
NATURE
1983; 306 (5944): 651-653
View details for Web of Science ID A1983RU75800032
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THE SOFTWARE TOOLS - UNIX CAPABILITIES ON NON-UNIX SYSTEMS
BYTE
1983; 8 (11): 430-?
View details for Web of Science ID A1983RP43900038
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DETECTION OF SOLAR 5-MINUTE OSCILLATIONS OF LOW DEGREE
SOLAR PHYSICS
1983; 82 (1-2): 75-87
View details for Web of Science ID A1983QD74700008
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THE STRUCTURE OF THE HELIOSPHERIC CURRENT SHEET - 1978-1982
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
1983; 88 (NA12): 9910-9918
View details for Web of Science ID A1983RU76400003
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STRUCTURE OF THE SOLAR OSCILLATION WITH PERIOD NEAR 160 MINUTES
SOLAR PHYSICS
1983; 82 (1-2): 37-42
View details for Web of Science ID A1983QD74700004
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OBSERVATION OF ADDITIONAL LOW-DEGREE 5-MIN MODES OF SOLAR OSCILLATION
NATURE
1982; 297 (5864): 312-313
View details for Web of Science ID A1982NR10800059
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STRUCTURE OF THE HELIOSPHERIC CURRENT SHEET IN THE EARLY PORTION OF SUNSPOT CYCLE 21
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
1982; 87 (NA12): 331-338
View details for Web of Science ID A1982PV79500004
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GEOMAGNETIC-ACTIVITY AND HALE SECTOR BOUNDARIES
PLANETARY AND SPACE SCIENCE
1981; 29 (2): 167-170
View details for Web of Science ID A1981LC94100004
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WHAT CAUSES THE WARP IN THE HELIOSPHERIC CURRENT SHEET
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
1981; 86 (NA7): 5899-5900
View details for Web of Science ID A1981LY47800053
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SOLAR-FLARE ACCELERATION OF SOLAR-WIND - INFLUENCE OF ACTIVE REGION MAGNETIC-FIELD
SCIENCE
1981; 212 (4502): 1501-1502
Abstract
The direction of the photospheric magnetic field at the site of a solar flare is a good predictor of whether the flare will accelerate solar wind plasma. If the field has a southward component, high-speed solar wind plasma is usually observed near the earth about 4 days later. If the field has a northward component, such high-speed solar wind is almost never observed. Southward-field flares may then be expected to have much larger terrestrial effects than northward flares.
View details for Web of Science ID A1981LT86900022
View details for PubMedID 17790539
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ON THE NATURE OF THE APPARENT RESPONSE OF THE VORTICITY AREA INDEX TO THE SOLAR MAGNETIC-FIELD
SOLAR PHYSICS
1981; 74 (2): 421-432
View details for Web of Science ID A1981MP23100009
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FURTHER EVIDENCE OF SOLAR OSCILLATIONS WITH A PERIOD OF 160 MINUTES
ASTROPHYSICAL JOURNAL
1980; 237 (3): L97-L98
View details for Web of Science ID A1980JW88000009
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DOPPLER OBSERVATIONS OF SOLAR ROTATION
ASTROPHYSICAL JOURNAL
1980; 239 (2): L89-L90
View details for Web of Science ID A1980KJ28600011
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ORIGIN OF THE WARPED HELIOSPHERIC CURRENT SHEET
SCIENCE
1980; 209 (4456): 603-605
Abstract
The warped heliospheric current sheet for early 1976 is calculated from the observed photospheric magnetic field by a potential field method. Comparisons with measurements of the interplanetary magnetic field polarity for early 1976 obtained at several locations in the heliosphere by Helios 1, Helios 2, Pioneer 11, and at the earth show a rather detailed agreement between the computed current sheet and the observations. It appears that the large-scale structure of the warped heliospheric current sheet is determined by the structure of the photospheric magnetic field and that "ballerina skirt" effects may add small-scale ripples.
View details for Web of Science ID A1980KA48500027
View details for PubMedID 17756844
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THE ROTATION OF THE SUN - OBSERVATIONS AT STANFORD
ASTROPHYSICAL JOURNAL
1980; 241 (2): 811-819
View details for Web of Science ID A1980KY79700031
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INTENSITY OF TROPOSPHERIC CIRCULATION ASSOCIATED WITH SOLAR MAGNETIC-SECTOR BOUNDARY TRANSITS
JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS
1979; 41 (6): 657-659
View details for Web of Science ID A1979HB33900012
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SOLAR VARIABILITY AND TERRESTRIAL WEATHER
REVIEWS OF GEOPHYSICS
1979; 17 (4): 724-731
View details for Web of Science ID A1979HG31800024
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VARIATION WITH TIME OF A SUN-WEATHER EFFECT
NATURE
1979; 280 (5725): 845-845
View details for Web of Science ID A1979HJ27100069
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INTER-PLANETARY MAGNETIC-FIELD POLARITY AND THE SIZE OF LOW-PRESSURE TROUGHS NEAR 180-DEGREES-W LONGITUDE
SCIENCE
1979; 204 (4388): 60-62
Abstract
When the interplanetary magnetic field is directed away from the sun, the area of wintertime low-pressure (300-millibar) troughs near 180 degrees W longitude is significantly larger than when the field is toward the sun. This relation persists during most of the winters of 1951 to 1973.
View details for Web of Science ID A1979GP33300027
View details for PubMedID 17816739
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OBSERVATIONS OF SOLAR OSCILLATIONS WITH PERIODS OF 160 MINUTES
NATURE
1979; 277 (5698): 635-637
View details for Web of Science ID A1979GJ89400034
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AVERAGE PHOTOSPHERIC POLOIDAL AND TOROIDAL MAGNETIC-FIELD COMPONENTS NEAR SOLAR MINIMUM
SOLAR PHYSICS
1979; 61 (2): 233-245
View details for Web of Science ID A1979GY49400002
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OBSERVATIONAL SEARCH FOR LARGE-SCALE ORGANIZATION OF 5-MINUTE OSCILLATIONS ON SUN
SOLAR PHYSICS
1978; 57 (1): 1-11
View details for Web of Science ID A1978FD40200001
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STRENGTH OF SUNS POLAR FIELDS
SOLAR PHYSICS
1978; 58 (2): 225-239
View details for Web of Science ID A1978FY24800002
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ATTEMPT TO DEFINE GEOGRAPHICAL AREA NEAR GULF OF ALASKA IN WHICH A PHYSICAL RELATIONSHIP EXISTS BETWEEN INTER-PLANETARY MAGNETIC-SECTOR POLARITY AND AREA OF LOW-PRESSURE TROUGHS
AMER GEOPHYSICAL UNION. 1978: 368–68
View details for Web of Science ID A1978ES70801012
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USING DYNAMO THEORY TO PREDICT SUNSPOT NUMBER DURING SOLAR CYCLE-21
GEOPHYSICAL RESEARCH LETTERS
1978; 5 (5): 411-414
View details for Web of Science ID A1978EZ99100024
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MEAN MAGNETIC-FIELD OF SUN - METHOD OF OBSERVATION AND RELATION TO INTERPLANETARY MAGNETIC-FIELD
SOLAR PHYSICS
1977; 52 (1): 3-12
View details for Web of Science ID A1977DQ15600001
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MORPHOLOGY OF A SUN-WEATHER EFFECT
AMER GEOPHYSICAL UNION. 1977: 697–97
View details for Web of Science ID A1977DP36300145
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COMPARISON OF H-ALPHA SYNOPTIC CHARTS WITH LARGE-SCALE SOLAR MAGNETIC-FIELD AS OBSERVED AT STANFORD
SOLAR PHYSICS
1977; 55 (1): 63-68
View details for Web of Science ID A1977EH07300004
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MEAN MAGNETIC-FIELD OF SUN - OBSERVATIONS AT STANFORD
SOLAR PHYSICS
1977; 54 (2): 353-361
View details for Web of Science ID A1977EF60400007
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REALITY OF A SUN-WEATHER EFFECT
JOURNAL OF THE ATMOSPHERIC SCIENCES
1976; 33 (6): 1113-1116
View details for Web of Science ID A1976BV24200018
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SEASONAL-VARIATION AND MAGNITUDE OF SOLAR SECTOR STRUCTURE ATMOSPHERIC VORTICITY EFFECT
NATURE
1975; 255 (5509): 539-540
View details for Web of Science ID A1975AE48600017
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SUNS MAGNETIC-SECTOR STRUCTURE
SOLAR PHYSICS
1975; 45 (1): 83-91
View details for Web of Science ID A1975BE33200009
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INFLUENCE OF SOLAR MAGNETIC-SECTOR STRUCTURE ON TERRESTRIAL ATMOSPHERIC VORTICITY
JOURNAL OF THE ATMOSPHERIC SCIENCES
1974; 31 (2): 581-588
View details for Web of Science ID A1974S570200025
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RELATIONSHIP BETWEEN SLOWLY VARYING COMPONENT OF SOLAR RADIO-EMISSION AND LARGE-SCALE PHOTOSPHERIC MAGNETIC-FIELD PATTERNS
SOLAR PHYSICS
1974; 35 (2): 361-368
View details for Web of Science ID A1974T276900013
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CORRELATION AND SPECTRAL ANALYSIS OF DAILY SOLAR RADIO FLUX
SOLAR PHYSICS
1973; 30 (1): 149-158
View details for Web of Science ID A1973Q686000019
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SOLAR MAGNETIC SECTOR STRUCTURE - RELATION TO CIRCULATION OF EARTHS ATMOSPHERE
SCIENCE
1973; 180 (4082): 185-186
Abstract
The solar magnetic sector structure appears to be related to the average area of high positive vorticity centers (low-pressure troughs) observed during winter in the Northern Hemisphere at the 300-millibar level. The average area of high vorticity decreases (low-pressure troughs become less intense) during a few days near the times at which sector boundaries are carried past the earth by the solar wind. The amplitude of the effect is about 10 percent.
View details for Web of Science ID A1973P215100022
View details for PubMedID 17811657
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SOLAR MAGNETIC SECTOR STRUCTURE - INFLUENCE ON STRATOSPHERIC CIRCULATION
AMER GEOPHYSICAL UNION. 1973: 444-?
View details for Web of Science ID A1973P101201131
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MEAN PHOTOSPHERIC MAGNETIC-FIELD FROM SOLAR MAGNETOGRAMS - COMPARISONS WITH INTERPLANETARY MAGNETIC-FIELD
SOLAR PHYSICS
1972; 22 (2): 418-&
View details for DOI 10.1007/BF00148706
View details for Web of Science ID A1972L983000013
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DIFFERENTIAL ROTATION IN SOLAR ATMOSPHERE INFERRED FROM OPTICAL, RADIO, AND INTERPLANETARY DATA
SOLAR PHYSICS
1972; 26 (1): 15-?
View details for Web of Science ID A1972O171200003
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EXPERIMENT IN COMPUTER MEASUREMENT OF MELODIC VARIATION IN FOLKSONG
JOURNAL OF AMERICAN FOLKLORE
1971; 84 (332): 231-241
View details for Web of Science ID A1971Y106600006
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COMPARISON OF MEAN PHOTOSPHERIC MAGNETIC FIELD AND INTERPLANETARY MAGNETIC FIELD
SOLAR PHYSICS
1970; 15 (1): 3-?
View details for Web of Science ID A1970I129600001