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H Escape Rates Inferred from MAVEN/IUVS Observations of the Mars Hydrogen Corona
Chaffin, Michael S.; Chaufray, Jean-Yves; Deighan, Justin et al.
2016In AAS/Division for Planetary Sciences Meeting Abstracts
 

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Abstract :
[en] H escape oxidizes and dessicates the Mars atmosphere and surface, providing a key control on the present-day chemistry and long-term evolution of the planet. Recently, large variations in the escape rate of H as a function of season have been reported by several studies, making continued observation of the variation a high priority. We present escape rates derived from Mars Atmosphere and Volatile EvolutioN (MAVEN) mission Imaging UltraViolet Spectrograph (IUVS) observations of the extended atmosphere of Mars at H Lyman alpha (121.6 nm), which must be interpreted with a coupled density/radiative transfer model owing to the optically thick nature of the emission and the small fraction of H present in the corona on escaping trajectories. We recover densities, temperatures, and escape rates under the assumption of spherical symmetry for multiple periods across MAVEN's mission so far, beginning in December 2014 (escape rates ~4e8/cm2/s). We describe the observed variation and compare it with previously observed seasonal variation in retrieved H escape rates, providing a necessary input for future photochemical modeling studies and estimates of water loss from Mars over its history.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Chaffin, Michael S.;  University of Colorado
Chaufray, Jean-Yves;  LATMOS
Deighan, Justin;  University of Colorado
Schneider, Nicholas M.;  University of Colorado
McClintock, William;  University of Colorado
Stewart, A. Ian F.;  University of Colorado
Thiemann, E. M.;  University of Colorado
Clarke, John T.;  Boston University
Holsclaw, Gregory;  University of Colorado
Jain, Sonal Kumar;  University of Colorado
Crismani, Matteo;  University of Colorado
Stiepen, Arnaud ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Labo de physique atmosphérique et planétaire (LPAP)
Montmessin, Franck;  LATMOS
Eparvier, Francis;  University of Colorado
Jakosky, Bruce M.;  University of Colorado)
More authors (5 more) Less
Language :
English
Title :
H Escape Rates Inferred from MAVEN/IUVS Observations of the Mars Hydrogen Corona
Publication date :
01 October 2016
Event name :
DPS meeting
Event date :
du 16 au 21 octobre 2016
Main work title :
AAS/Division for Planetary Sciences Meeting Abstracts
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since 27 April 2017

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