Physics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.8301h&link_type=abstract
Journal of Geophysical Research, vol. 84, Dec. 30, 1979, p. 8301-8310. Research supported by the Science Research Council of En
Physics
1
Dust Storms, Mars Atmosphere, Opacity, Thermal Mapping, Atmospheric Models, Atmospheric Temperature, Emissivity, Infrared Spectra, Mars Surface, Radiative Transfer, Satellite-Borne Photography, Spectrum Analysis, Surface Temperature, Viking Lander 1
Scientific paper
In this paper, a procedure to estimate the opacity of Martian dust storms from the spectral measurements made by the Viking infrared thermal mapping instrument is developed. Methods are also produced to estimate the surface temperature and the effective temperature of the dust cloud from these observations, in conjunction with the lander opacity observations. The derived opacities, for various locations on the planet, show the basic trends identified in the lander measurements. At the height of the second dust storm 9-micron opacities of approximately 3 are derived, which correspond to values of approximately 5 at visible wavelengths. The analysis of zonally averaged data for the southern hemisphere at the time of the second major dust storm indicates dust opacities of approximately 2-3 remaining at 1800-2400 LT, with the maximum opacity occurring in the late afternoon period.
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