Occultation of Epsilon Geminorum by Mars. IV - Oblateness of the Martian upper atmosphere

Astronomy and Astrophysics – Astronomy

Scientific paper

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Electrophotometry, Mars Atmosphere, Planetary Structure, Stellar Occultation, Upper Atmosphere, Atmospheric Models, Atmospheric Tides, Light Curve, Oblate Spheroids, Mars, Occultations, Atmosphere, Oblateness, Photoelectric Observations, Thermal Gradients, Altitude, Light Curve, Comparisons, Astrometry, Data, Procedure

Scientific paper

The oblateness of the Martian upper atmosphere was determined from analysis of photoelectric observations of the April 8, 1976 occultation of Epsilon Geminorum by Mars at seven stations. The oblateness is 0.0096 + or - 0.0023, consistent with a mean equator-to-pole temperature difference in excess of approximately 50 K, vertically averaged from the surface to the occultation altitude of approximately 70 km. The astrometric solution provides a precise determination of the occultation path relative to the Martian shadow, and an absolute vertical alignment of upper atmospheric temperature profiles obtained by the inversion of occultation light curves. The observations can be compared directly with models of the atmospheric tides computed for the conditions at the suboccultation regions on Mars.

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