The O2 nightglow in the Martian atmosphere by SPICAM onboard of Mars-Express

Details The O2 nightglow in the Martian atmosphere by SPICAM onboard of Mars-Express The O2 nightglow in the Martian atmosphere by SPICAM onboard of Mars-Express

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf.1854f&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.1854

Physics

Scientific paper

In contract to the dayglow of oxygen in 1.27 μm band on Mars which comes out of ozone photolysis and has been detected for a long time ago, the nightglow is expected in two times less intensive [1,2]. The nightglow is a product of oxygen recombination formed by dayside CO2 photolysis at the altitudes higher than 70 km and transported on the nightside by the Hadley circulation. The first possible detection of the emission has been performed by Krasnopolsky [1] in 2003, but the wide field of view during the ground-based observations prevented from the sure detection of the nightside emission by oxygen recombination. Krasnopolsky has concluded that a residual dayside emission can contribute a lot in the observed airglow due to a long lifetime of excited oxygen atoms. The first direct observation of the day-side emission were provided at limb geometry by the OMEGA spectrometer on the Mars-Express orbiter (3 vertical profiles have been detected [3-4], confirmed in the CRISM experiment on Mars-Reconnaissance-Orbiter [5]. All observations related to southern and northern Poles at polar night. The observation of the nightglow at poles is quite important due to it can relate to poorly constrained meridional transport into the polar atmosphere. Moreover the O2 emission allows to retrieve the atomic oxygen profile at altitude of the emission formation.

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