Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986lastr.100..327d&link_type=abstract
L'Astronomie (ISSN 0004-6302), vol. 100, July-Aug. 1986, p. 327-343. In French.
Astronomy and Astrophysics
Astronomy
Mars (Planet), Mars Surface, Albedo, Astronomical Photography, Dust Storms, Mars Atmosphere, Polar Caps
Scientific paper
A choronology is presented of events on Mars which were observed optically by astronomers in the period 1981-1982. The observational period had the benefits of a strong opposition, providing a 14.7 arcsec sky image of the planet. The polar cap was seen to retreat to an area covering less than 10 deg of latitude. The planetary albedo, however, remained equal to that of 1980. The appearance of various new spots and the fading of old dark spots are described. Limb observations continually detected the presence of white clouds, particularly in the vicinity of the highest mountains. Dust storms, being initiated in regions of highest insolation, were more numerous (and less intense) in the northern hemisphere than in the southern hemisphere. The dust lofted by the storms remained in suspension in the atmosphere for up to 2 mos.
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