Physics
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992msat.work...35c&link_type=abstract
In Lunar and Planetary Inst., Workshop on the Martian Surface and Atmosphere Through Time p 35 (SEE N92-28988 19-91)
Physics
Atmospheric Moisture, Interferometers, Line Spectra, Mars Atmosphere, Pressure Broadening, Remote Sensing, Very Large Array (Vla), Water Vapor, Angular Resolution, Diurnal Variations, High Resolution, Northern Hemisphere, Sensitivity, Vertical Distribution, Winter
Scientific paper
We report preliminary results of 1.35 cm spectral line observations, in which we employed the NRAO Very Large Array (VLA) interferometer to map the horizontal and vertical distributions of water vapor around the Mars atmospheric limb in early Dec. of 1990. The increased atmospheric pathlengths presented near the limb of Mars and the high angular resolution afforded by the VLA at centimeter wavelengths lead to a remarkably sensitive, remote measurement of water in the atmosphere of Mars. We achieve approximately 300 km horizontal resolution on Mars, operating in the C configuration of the VLA, when Mars was 17.3 inches in diameter. This allows us to resolve the latitudinal and diurnal variations in atmospheric water emission around the limb of Mars. We derive the vertical distribution of atmospheric water from observed pressure broadening in the spectrally resolved lineshapes. These observations, which consist of two eight-hour integrations obtained on Dec. 3-4 and Dec. 6-7, correspond to late winter in the Northern Hemisphere of Mars (Ls = 344 degrees).
Clancy Todd R.
Grossman Arie W.
Muhleman Duane O.
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