Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...214..934a&link_type=abstract
Astrophysical Journal, Part 1, vol. 214, June 15, 1977, p. 934-945.
Astronomy and Astrophysics
Astrophysics
1
Atmospheric Turbulence, Mars Atmosphere, Scintillation, Stellar Occultation, Atmospheric Circulation, Atmospheric Temperature, Carbon Dioxide, Correlation, Light Curve, Scale Height, Telescopes
Scientific paper
An analysis of observations of the occultation of Epsilon Gem by Mars on April 8, 1976, is presented. The data were obtained by three neighboring telescopes at McDonald Observatory. Intensity fluctuations on time scales of the order of 100 ms were observed simultaneously at the three telescopes. As the observations compare well with predictions of turbulent scintillation theory, it is concluded that such fluctuations were probably largely the effect of stellar scintillations in the Martian atmosphere. The stellar diameter is included as a parameter in the theory but in a way which differs from previously published interpretations of occultations of extended sources by planetary atmospheres. Scintillations govern the experimental uncertainty in the deduction of the scale height of the high Martian atmosphere. A density scale height of 9.9 + or - 2.5 km is obtained at an altitude of 74 + or - 8 km above the mean surface. For CO 2 gas, this result corresponds to a temperature of 190 + or - 50 K.
Africano John
de Vaucouleurs Gerard
Edward Nather R.
Evans Silvan D.
Finkel B. E.
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