Three-dimensional structure in the Mars H corona revealed by IUVS on MAVEN

Chaffin, M. S.; Chaufray, J. Y.; Deighan, J.; Schneider, N. M.; Mcclintock, W. E.; Stewart, A. I. F.; Thiemann, E.; Clarke, J. T.; Holsclaw, G. M.; Jain, S. K.; Crismani, M. M. J.; Stiepen, Arnaud; Montmessin, F.; Eparvier, F. G.; Chamberlain, P. C.; Jakosky, Bruce M.

doi:10.1002/2015GL065287

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Three-dimensional structure in the Mars H corona revealed by IUVS on MAVEN

Chaffin, M. S.; Chaufray, J. Y.; Deighan, J. et al.

2015 • In Geophysical Research Letters

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https://hdl.handle.net/2268/190833

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10.1002/2015GL065287

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Keywords :

Atmospheric escape; H corona; Jeans escape; Mars; MAVEN; Water loss; Earth sciences; Geophysics; Radiative transfer

Abstract :

[en] Loss of water to space via neutral hydrogen escape has been an important process throughout Martian history. Contemporary loss rates can be constrained through observations of the extended neutral hydrogen atmosphere of Mars in scattered sunlight at 121.6 nm. Historically, such observations have been interpreted with coupled density and radiative transfer models, inferring escape fluxes from brightness profiles gathered by flybys, orbiters, and telescope observations. Here we demonstrate that the spherical symmetry assumed by prior analyses cannot reproduce observations by the Imaging Ultraviolet Spectrograph (IUVS) on the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission. We present unique observations of the Mars H corona to large radial distances and mapping results from initial MAVEN science at Mars. These observations represent the first detection of three-dimensional structure in the H corona of Mars, with implications for understanding the atmosphere today and the loss of H to space throughout Martian history. © 2015. American Geophysical Union. All Rights Reserved.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Chaffin, M. S.; Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder, Colorado USA

Chaufray, J. Y.; LATMOS/IPSL, Guyancourt Yvelines/Île-de-France Guyancourt France

Deighan, J.; Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder, Colorado USA

Schneider, N. M.; Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder, Colorado USA

Mcclintock, W. E.; Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder, Colorado USA

Stewart, A. I. F.; Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder, Colorado USA

Thiemann, E.; Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder, Colorado USA

Clarke, J. T.; Center for Space Physics Boston University Boston, Massachusetts USA

Holsclaw, G. M.; Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder, Colorado USA

Jain, S. K.; Laboratory for Atmospheric and Space Physics University of Colorado Boulder Boulder, Colorado USA

More authors (6 more)

Language :

English

Title :

Three-dimensional structure in the Mars H corona revealed by IUVS on MAVEN

Publication date :

2015

Journal title :

Geophysical Research Letters

ISSN :

0094-8276

eISSN :

1944-8007

Publisher :

Blackwell Publishing

Peer reviewed :

Peer Reviewed verified by ORBi

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