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    He bulge revealed: He and CO2 diurnal and seasonal variations in the upper atmosphere of Mars as detected by MAVEN NGIMS

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    Name:
    Elrod_et_al-2017-Journal_of_Ge ...
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    Author
    Elrod, M. K. cc
    Bougher, S. cc
    Bell, J.
    Mahaffy, P. R.
    Benna, M. cc
    Stone, S.
    Yelle, R., V
    Jakosky, B. M. cc
    Affiliation
    Univ Arizona, Lunar & Planetary Lab
    Univ Arizona, Dept Planetary Sci
    Issue Date
    2017
    
    Metadata
    Show full item record
    Publisher
    AMER GEOPHYSICAL UNION
    Citation
    He bulge revealed: He and CO2 diurnal and seasonal variations in the upper atmosphere of Mars as detected by MAVEN NGIMS 2017 Journal of Geophysical Research: Space Physics
    Journal
    Journal of Geophysical Research: Space Physics
    Rights
    © 2017. American Geophysical Union. All Rights Reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    Analysis of the Neutral Gas and Ion Mass Spectrometer (NGIMS) on the Mars Atmosphere Volatiles and EvolutioN (MAVEN) spacecraft closed source data from all orbits with good pointing revealed an enhanced Helium [He] density on the nightside orbits and a depressed He density on the dayside by about a factor of 10-20. He was also found to be larger in the polar regions than in the equatorial regions. The northern polar winter nightside He bulge was approximately twice that of the northern polar summer nightside bulge. The first 6 weeks of the MAVEN prime mission had periapsis at high latitudes on the nightside during northern winter, followed by the midlatitudes on the dayside moving to low latitudes on the nightside returning to the high latitudes during northern summer. In this study we examined the NGIMS data not only in the different latitudes but sorted by solar longitude (Ls) in order to separate the diurnal or local solar time (LST) effects from the seasonal effects. The Mars Global Ionosphere-Thermosphere Model (M-GITM) has predicted the formation of a He bulge in the upper atmosphere of Mars on the nightside early morning hours (Ls =2-5h) with more He collecting around the poles. Taking a slice at constant altitude across all orbits indicates corresponding variations in He and CO2 with respect to LST and Ls and a diurnal and seasonal dependence.
    Note
    6 month embargo; First published: 23 February 2017
    ISSN
    21699380
    DOI
    10.1002/2016JA023482
    Version
    Final published version
    Sponsors
    NASA through the Mars Exploration Program
    Additional Links
    http://doi.wiley.com/10.1002/2016JA023482
    ae974a485f413a2113503eed53cd6c53
    10.1002/2016JA023482
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    UA Faculty Publications

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