Nightglow in the Upper Atmosphere of Mars and Implications for Atmospheric Transport

Author:

Bertaux Jean-Loup12345,Leblanc François12345,Perrier Séverine12345,Quemerais E.12345,Korablev Oleg12345,Dimarellis E.12345,Reberac A.12345,Forget F.12345,Simon P. C.12345,Stern S. A.12345,Sandel Bill12345,

Affiliation:

1. Service d'Aéronomie du CNRS/Institut Pierre-Simon Laplace (IPSL), BP.3, 91371, Verrières-le-Buisson, France.

2. Space Research Institute (IKI), 84/32 Profsoyuznaya, 117810 Moscow, Russia.

3. Laboratoire de Méteorologie Dynamique/IPSL, University Paris 6, 75252 Paris, France.

4. Belgian Institute for Space Aeronomy (BIRA), 3 Avenue Circulaire, B-1180 Brussels, Belgium.

5. Southwest Research Institute, Boulder, CO 80302, USA.

Abstract

We detected light emissions in the nightside martian atmosphere with the SPICAM (spectroscopy for the investigation of the characteristics of the atmosphere of Mars) ultraviolet (UV) spectrometer on board the Mars Express. The UV spectrum of this nightglow is composed of hydrogen Lyman α emission (121.6 nanometers) and the γ and δ bands of nitric oxide (NO) (190 to 270 nanometers) produced when N and O atoms combine to produce the NO molecule. N and O atoms are produced by extreme UV photodissociation of O 2 , CO 2 , and N 2 in the dayside upper atmosphere and transported to the night side. The NO emission is brightest in the winter south polar night because of continuous downward transport of air in this region at night during winter and because of freezing at ground level.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference28 articles.

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2. C. A. Barth et al., J. Geophys. Res.76, 2213 (1971).

3. C. A. Barthet al., in Mars, H. Kieffer et al., Eds. (University of Arizona Press, Tucson, AZ, 1992), pp. 1054–1089, and references therein.

4. J. L. Bertaux et al., Planet. Space Sci.48, 1303 (2000).

5. Adv. Space Res.

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