CEDAR email: CEDAR/GEM Session Report: Exosphere influence on Geospace

krall jonathan.krall at nrl.navy.mil
Thu Oct 20 14:13:33 MDT 2016

Session Title: What is the composition of the exosphere and how does it 
influence the topside ionosphere and plasmasphere?

Conveners: J. Krall (NRL), A. G. Burns (HAO), S. E. McDonald (NRL), J. 
T. Emmert (NRL), F. Sassi (NRL)

Additional contributors: Ed Mierkiewicz (Embry-Riddle), Rodney Viereck 
(NOAA) , Robert Schunk (Utah State University), Daniel Weimer (Virginia 
Tech), Jianqi Qin (University of Illinois at Urbana-Champaign), Richard 
Denton (Dartmouth College), Raluca Ilie (University of Michigan), Alex 
Glocer (NASA/GSFC), Susan M. Nossal (University of Wisconsin), John Noto 
(Scientific Solutions, Inc.)

Oxygen and hydrogen densities in the thermosphere and exosphere can 
affect the polar wind composition [Schunk], the strength of the 
magnetospheric ring current [Illie, Glocer] and the rate of 
plasmasphere refilling following a storm [Krall]. The O density varies 
daily by up to 20% [Krall] while the H density appears to be increasing 
as a result of climate change [Nossal]. This latter fact reminds us that 
current empirical H models have uncertainties and assumptions that 
should perhaps be re-examined [Burns]. While H is difficult to measure 
[Mierkiewicz, Viereck, Qin, Noto], limb scans from  the GUVI (Global 
Ultraviolet Imager) instrument on the TIMED satellite are promising 

A full report can be found at

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