Martian mesospheric cloud observations by IUVS on MAVEN: Thermal tides coupled to the upper atmosphere

Michael H. Stevens 1 David E. Siskind 1 J. Scott Evans 2 Sonal K. Jain 3 Nicholas M. Schneider 3 Justin Deighan 3 A. Ian F. Stewart 3 Matteo Crismani 3 Arnaud Stiepen 4, 5 Michael Scott Chaffin 3 William E. Mcclintock 3 Gregory M. Holsclaw 3 Franck Lefèvre 6 Daniel Y. Lo 7 John T. Clarke 8 Franck Montmessin 6 Bruce M. Jakosky 3
1 Space Science Division [Washington]
2 Computational Physics, Inc.
3 LASP - Laboratory for Atmospheric and Space Physics [Boulder]
4 STAR - Space Sciences, Technologies and Astrophysics Research Institute
5 LPAP - Laboratoire de Physique Atmosphérique et Planétaire
6 IMPEC - LATMOS
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
7 Lunar and Planetary Laboratory [Tucson]
8 CSP - Center for Space Physics [Boston]
Abstract : We report observations of Martian mesospheric ice clouds and thermospheric scale heights by the Imaging Ultraviolet Spectrograph on NASA's Mars Atmosphere and Volatile Evolution mission. The clouds are observed between 6 AM and 8 AM local time using mid-UV limb observations between 60 and 80 km tangent altitude where ice particles that scatter sunlight can appear as detached layers near the equator. The equatorial longitudinal distribution shows populations of clouds near -110° E and -10° E as well as a population near 90° E, which does not have a clear precedent. The cloud populations indicate a wave 3 pattern near 70 km, which is confirmed by independent mesospheric temperature observations. Scale heights 100 km above the clouds derived from concurrent IUVS observations also reveal a wave 3 longitudinal structure, suggesting that the temperature oscillations enabling the formation of mesospheric clouds couple to the upper atmosphere.
Keywords : Mesosphere Clouds Tides Temperature Mars
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Geophysical Research Letters, American Geophysical Union, 2017, 44 (10), pp.4709-4715. 〈10.1002/2017GL072717〉
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Contributeur : Catherine Cardon <>
Soumis le : mardi 9 mai 2017 - 11:27:22
Dernière modification le : mercredi 19 septembre 2018 - 01:29:18

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INSU | LATMOS | UPMC | UVSQ | UNIV-PARIS-SACLAY

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Michael H. Stevens, David E. Siskind, J. Scott Evans, Sonal K. Jain, Nicholas M. Schneider, et al.. Martian mesospheric cloud observations by IUVS on MAVEN: Thermal tides coupled to the upper atmosphere. Geophysical Research Letters, American Geophysical Union, 2017, 44 (10), pp.4709-4715. 〈10.1002/2017GL072717〉. 〈insu-01519745〉

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