Polarimetric analysis of the Martian dust storms and clouds in 1971

Details Polarimetric analysis of the Martian dust storms and clouds in 1971 Polarimetric analysis of the Martian dust storms and clouds in 1971

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...131..123d&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 131, no. 1, Feb. 1984, p. 123-136.

Physics

Optics

22

Clouds, Dust Storms, Mars Atmosphere, Polarization Characteristics, Atmospheric Optics, Ice, Mars Photographs, Polarimetry, Reflectance, Time Response, Mars, Dust, Storms, Polarimetric Observations, Analysis, Polarization, Crystals, Particles, Atmosphere, Polarimetry, Hellas, Opacity, Clouds

Scientific paper

When the atmosphere was free of flying dust, a thin haze was permanently detected by means of polarimetry for several weeks along the morning limb. It is noted that the polarization signature was consistent with an ice crystal cloud, forming every night and dissolving after sunrise. In similar fashion, an evening haze continuously formed a few hours before sunset. From August to December of that year, the large basin Hellas had a yellow-white hue and polarized, lightlike dust clouds. For five months it was continuously overcast by airborne dust. On July 11, a first small localized dust cloud was discovered by imagery over the northern border of Hellas expanding with a horizontal velocity of 100 km/h. After a few days the cloud settled, but polarimetry indicated that the atmosphere remained laden, on a global scale, with a small amount of airborne dust for several weeks. The major dust storm event began on September 22 at the same location as its precursor. In 10 days it had expanded into a planet-wide and complete obscuration of all surface features.

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