Prof. Close's research involves space weather detection and modeling for improved spacecraft designs, and advanced signal processing and electromagnetic wave interactions with plasma for ground-to-satellite communication systems. These topics fall under the Space Situational Awareness (SSA) umbrella that include environmental remote sensing using satellite systems and ground-based radar. Her current efforts are the MEDUSSA (Meteoroid, Energetics, and Debris Understanding for Space Situational Awareness) program, TALIS (Tomographic Array for Lightning and Ionospheric Studies) using ground-based and space-based RF sensors, and using ground-based radar data to characterize the meteoroid population and its threat to spacecraft. Future work includes using CubeSats for asteroid detection and characterization.

Academic Appointments

Honors & Awards

  • Joe D. Marshall Award for Outstanding Technical Briefing, AFTAC (2013)
  • 1st Place Student Paper Competition, International Union of Radio Science (2013)
  • Magazine Cover, IEEE Spectrum (2008)
  • Hellman Faculty Scholar, Hellman Fellows Program (2010)
  • Career Award, National Science Foundation (2011-2016)

Boards, Advisory Committees, Professional Organizations

  • Member, Arecibo Science Advisory Panel (2013 - Present)
  • Elected Vice Chair Commission G, URSI (2013 - Present)
  • Member, National Research Council Aeronautics and Space Engineering Board Micrometeoroid and Orbital Debris Panel (2013 - Present)
  • Member, Meteoroids Scientific Organizing Committee (2010 - 2010)
  • Member, National Research Council Aeronautics and Space Engineering Board Review of Near-Earth Object Surveys and Hazard Mitigation Strategies Mitigation Panel (2013 - Present)

Postdoctoral Advisees

Journal Articles

  • Dependence of radar signal strength on frequency and aspect angle of non-specular trails J. Geophys. Res. Close, S., Hamlin, T., Oppenheim, M., Cox, L., Colestock, P. 2008; 113: A06203

    View details for DOI 10.1029/2007JA012647

  • Meteor head echo radar data: Mass-velocity selection effects Icarus Close, S., Brown, P., Campbell-Brown, M., Oppenheim, M., Colestock, P. 2007; 186: 547-556
  • A new method for determining meteoroid mass from head echo data J. Geophys. Res. Close, S., Oppenheim, M., Durand, D., Dyrud, L. 2005; 110: A09308

    View details for DOI 10.1029/2004JA010950

  • A technique for calculating meteor plasma density and mass from radar head echo scattering Icarus Close, S., Oppenheim, M., Hunt, S., Coster, A. 2004; 168: 43-52
  • Scattering characteristics of high-resolution meteor head echoes detected at multiple frequencies J. Geophys. Res. Close, S., Oppenheim, M., Hunt, S., Dyrud, L. 2002; 107: 1295

    View details for DOI 10.1029/2002JA009253

  • Analysis of Perseid meteor head echo data collected using the Advanced Research Projects Agency Long-Range Tracking and Instrumentation Radar (ALTAIR) Radio Sci. Close, S., Hunt, S., Minardi, M., McKeen, F. 2000; 35: 1233-1240