H Escape in 3D: MAVEN IUVS observations of the Mars corona

Abstract : Mars has lost a significant fraction of its initial water inventory to space, as evidenced by surface morphology and an enrichment of the heavy isotope deuterium relative to hydrogen. This loss continues today via thermal Jeans escape of neutral hydrogen from the extended H corona. The Mars Atmosphere and Volatile EvolutioN mission's Imaging Ultraviolet Spectrometer IUVS constrains this escape with high cadence, spatially resolved measurements of the corona in scattered sunlight in the Lyman alpha line of neutral H at 121.6 nm. These measurements indicate spatial variability in the corona never before recognized, with potential effects on reconstructing the escape history of water and on retrieved escape rates from previous spatially unresolved observations. I will present our current progress in retrieving escape rates and density distributions from the IUVS observations, including the degree to which observations of the H corona can constrain the thermospheric general circulation at Mars.
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https://hal-insu.archives-ouvertes.fr/insu-01248560
Contributor : Catherine Cardon <>
Submitted on : Sunday, December 27, 2015 - 5:54:39 PM
Last modification on : Friday, July 26, 2019 - 1:44:04 PM

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  • HAL Id : insu-01248560, version 1

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Michael S. Chaffin, Jean-Yves Chaufray, Justin Deighan, Nicholas M. Schneider, William Mcclintock, et al.. H Escape in 3D: MAVEN IUVS observations of the Mars corona. AGU Fall Meeting 2015, Dec 2015, San Francisco, United States. pp.P13D-04. ⟨insu-01248560⟩

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