Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jbaa..102..248m&link_type=abstract
Journal of the British Astronomical Association, vol.102, no.5, p.248-264
Astronomy and Astrophysics
Astronomy
2
Scientific paper
The surface of Mars in 1990 closely resembled its appearance in 1988, with only very small modifications in detail. Northern hemisphere features were seen to better advantage than in 1988. The Martian atmosphere was generally very transparent, with normal white cloud activity and a moderate blue clearing about opposition. Yellow cloud activity was low, but three important local (or regional) dust storms began in the region of SW Chryse to Pyrrhae Regio in October, November and December. The recession of the S polar cap was followed, as well as activity in both polar hoods. Haze around the SPC formed unusually early and often obscured the cap. This report of the work of 74 observers covers the period 1989 December to 1991 June.
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