In person in B21/183a
Heliophysics Division Seminar
Wednesday, February 28th at 1pm ET
Title: The Wizard of O(z) ----- Thermosphere physics revisited
Abstract: This seminar is based on an Encyclopedia article that Jia Yue and Wenbin Wang recently wrote. The thermosphere is where many LEO objects including satellites, International Space Station and space debris are flying inside. Thermosphere density is by far the largest uncertainty forecasting satellite drag and orbit propagation. In this talk, I will review the recent progress of thermosphere physics driving the variability of thermosphere density, composition, temperature, and wind. In particular, mass density in the upper thermosphere is mainly controlled by the abundance of atomic oxygen as a function of geometric height (O(z)). Many processes can cause variations in O(z), including solar EUV heating, vertical and meridional advection, eddy and molecular diffusion, NO and CO2 cooling, etc. During geomagnetic active times, Joule heating, enhanced NO cooling, altered circulations, strong EUV heating and other processes lead to drastic changes of neutral density. At the end, I would review the fundamental thermosphere physics under the lens of future missions, GDC and DYNAMIC.
Bio: Jia Yue is the Ionosphere-Thermosphere-Mesosphere modeling lead scientist at the Coordinated Community Modeling Center (CCMC) in the Space Weather Lab. He received his PhD degree in Electrical and Computer Engineering from Colorado State University in 2009. Jia authored and coauthored over 160 journal papers, articles, and book chapters in mesosphere and thermosphere physics. His research interests include fundamental mesosphere and thermosphere physics, vertical coupling between the lower atmosphere and geospace, long term changes in the upper atmosphere, and optical remote sensing. He served on the AIM and TIMED science teams. He received the SCOSTEP Young Scientist Award and NASA Robert Goddard Award in Science. He is now an associate editor for JGR Atmospheres. He is also actively involved in Citizen Science as a coI of Spritacular.
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Bulent Atalay (University of Virginia (retired))