Sigrid Close

Sigrid Close is a professor in the Department of Aeronautics and Astronautics at Stanford University. Her primary research interest is the space environment with particular focus on meteoroids, meteors, and orbital debris, and their interaction with spacecraft and spacecraft operations.

Professor 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. She was a member of two NRC panels, in 2010 examining options for detecting and countering near-Earth objects, and in 2011 assessing NASA's meteoroid and orbital debris programs.