North polar HOOD observations during Martian dust storms

Details North polar HOOD observations during Martian dust storms North polar HOOD observations during Martian dust storms

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975icar...26..341m&link_type=abstract

Icarus, vol. 26, Nov. 1975, p. 341-352.

Computer Science

2

Dust Storms, Mars Photographs, Mars Surface, Polar Regions, Annual Variations, Cloud Cover, Mars Atmosphere, Ultraviolet Radiation

Scientific paper

The 1956, 1971, and 1973 major dust storms on Mars affected the apparent contrast and extent of the northern polar hood. A survey of photography from seven apparitions indicates that this seasonal feature is consistently prominent and identified in the absence of major storms throughout half of the Martian year. During the 1956 dust storm, the hood was not seen for a period of over one month on Lowell photographs. The effects of a storm are also seen in 1971 International Planetary Patrol photographs; the hood quickly became faint and tenuous even in ultraviolet light, which normally shows it as very bright. Patrol photographs of 1973 cover the complete progression from a prominent and extensive hood before the storm, to an intermittent disappearance at the height of the storm, to the subsequent return of a normal hood as the storm died out.

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