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- P43F-2729: Signatures of martian thermospheric water in D Lyman alpha emissions measured by MAVEN/IUVS
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Board 2729‚ Hall EFG (Poster Hall)NOLA CC
Author(s):Generic 'disconnected' Message
Eryn Cangi, Laboratory for Atmospheric and Space Physics (First Author, Presenting Author)
Michael Stevens, Naval Research Lab DC
Michael Chaffin, University of Colorado Boulder
Nicholas Schneider, Univ Colorado
John Clarke, Boston University
Majd Mayyasi, Boston University
Justin Deighan, Laboratory for Atmospheric and Space Physics
Sonal Jain, Laboratory for Atmospheric and Space Physics
Water vapor was recently detected around 100-150 km in the atmosphere of Mars at midday, using one mode of the MAVEN mission's IUVS instrument. Ideally this measurement could be confirmed by analyzing data from MAVEN's NGIMS instrument, which directly measures the gas, but this has been hard because the two instruments mostly don't operate at the same time or location. Also, water vapor is highly variable during the day and over the year. To get a second opinion on this detection, we used a different data set from another operating mode of IUVS that detects the hydrogen isotope, deuterium (D). D can be used as a proxy for detecting water because of certain properties of its UV emissions. We looked at ~5 Mars years of data, at different times of day, the year, and different locations. We used a type of observation where IUVS looks through the atmosphere along a line parallel to the planet's surface, revealing how much water there is at different altitudes. The results agree with the earlier work, suggesting water is present at these high altitudes. This continues to be interesting and warrants more study.
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