Structure of the atmosphere of Mars in summer at mid-latitudes

Details Structure of the atmosphere of Mars in summer at mid-latitudes Structure of the atmosphere of Mars in summer at mid-latitudes

Sep 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.4364s&link_type=abstract

Journal of Geophysical Research, vol. 82, Sept. 30, 1977, p. 4364-4378.

Astronomy and Astrophysics

Astronomy

53

Atmospheric Physics, Mars Atmosphere, Satellite-Borne Instruments, Spaceborne Astronomy, Summer, Accelerometers, Atmospheric Density, Atmospheric Pressure, Atmospheric Temperature, Mass Spectroscopy, Molecular Weight, Pressure Distribution, Pressure Sensors, Spacecraft Instruments, Temperature Profiles, Temperature Sensors, Viking Lander Spacecraft

Scientific paper

Instruments onboard Viking 1 and 2 landers were used to measure the structure of Mars' atmosphere in situ from near the surface to an altitude of 120 km. Atmospheric structure was found to be well defined by the instruments and relatively similar at the two sites. Viking 1 and 2 surface pressures were 7.62 and 7.81 mbar, and temperatures were 238 K and 236 K, respectively, with pressures at the elevation of the reference ellipsoid of 6.74 and 6.30 mbar. Mean temperature was found to decrease with a lapse rate of about 1.6 K/km (significantly subadiabatic) from above the boundary layer to about 40 km. The temperature was then near isothermal with a large-amplitude wave superimposed (attributed to the diurnal thermal tide). It is suggested that the mean profile is governed by radiative equilibrium. The obtained density data are found to merge well with those obtained by an upper-atmosphere spectrometer (at 200 km). The temperature wave is found to continue above 100 km while increasing in wavelength and amplitude.

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