Publication Date:
2015-11-06
Description:
Using the Mars Atmospheric and Volatile EvolutioN Mission (MAVEN) Imaging Ultraviolet Spectrograph (IUVS), we found periodic longitudinal variations in CO 2 density in the Martian atmosphere. These density variations are derived from observations of the emission from limb scans in the 100 − 190 km altitude range. The variations exhibit significant structure with longitudinal wavenumbers 1, 2 and 3 in an effectively constant local solar time frame, and we attribute this structure to non-migrating tides. The wave-2 component is dominated by the diurnal eastward-moving DE1 tide at the equator and the semidiurnal stationary S0 tide at the midlatitudes. Wave-3 is dominated by the diurnal eastward-moving DE2 tide, with possibly the semidiurnal eastward-moving SE1 tide causing an amplitude increase at the midlatitudes. Structure in the wave-1 component can be explained by the semidiurnal westward-moving SW1 tide.
Print ISSN:
0094-8276
Electronic ISSN:
1944-8007
Topics:
Geosciences
,
Physics
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