Variability of the Atmosphere/Thermosphere in the Northern Hemisphere of Mars: Analysis of the Data Obtained Onboard Mars Global Surveyor and Odyssey

Details Variability of the Atmosphere/Thermosphere in the Northern Hemisphere of Mars: Analysis of the Data Obtained Onboard Mars Global Surveyor and Odyssey Variability of the Atmosphere/Thermosphere in the Northern Hemisphere of Mars: Analysis of the Data Obtained Onboard Mars Global Surveyor and Odyssey

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa41a..02k&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SA41A-02

Physics

2427 Ionosphere/Atmosphere Interactions (0335), 2459 Planetary Ionospheres (5435, 5729, 6026, 6027, 6028), 5435 Ionospheres (2459), 6225 Mars, 6929 Ionospheric Physics (2409)

Scientific paper

The altitude of the main peak of the electron density (hpeak) and the neutral atmosphere scale-height in the vicinity of the peak (Hn) have been derived from the Mars Global Surveyor radio science data. The positive altitude gradient of Hn has been calculated. At SZA>82°, hpeak increases significantly with SZA while Hn is approximately constant. This indicates that Hn decreases with SZA when the altitude remains constant. At SZA<82°, where hpeak is approximately constant, the shape of isodensity surface of the neutral atmosphere in the vicinity of the main peak of the electron density has been derived using hpeak and Hn. The variations within the solar activity cycle have been analyzed. The isodensity of the neutral atmosphere has been compared with the longitudinal variations of the neutral atmosphere density as observed onboard Odyssey in the period Day 315-356, 2001. The difference in the phases of the non-migrating tidal waves, which were observed in the periods approximately separated by a half of Martian year: Day 344, 2000 -Day 31, 2001 and Day 315-356, 2001, may indicate either the seasonal variations or the local time effect.

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