Physics
Scientific paper
Feb 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.3247z&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. E2, p. 3247-3259.
Physics
53
Annual Variations, Dust Storms, Mars Atmosphere, Planetary Meteorology, Planetology, Space Observations (From Earth), Mars, Storms, Dust, Atmosphere, Frequency, Earth-Based Observations, Spacecraft Observations, Viking Missions, Size, Seasonal Variations, History, Mariner 9 Mission, Description, Viking 1 Lander, Pressure
Scientific paper
A recent review of earth-based telescopic observations of Mars together with Viking orbiter and lander data are employed to estimate the frequency of occurrence of planet-encircling dust storms over the past century and to test whether the period spanned by the Mariner 9 and Viking missions to Mars is representative of the decades prior to 1950. Both spacecraft and earth-based observations suggest that planet-encircling dust storms on Mars occur during a 'dust storm season' in southern spring and summer. Viking data show that planet-encircling dust storms could have occurred in the past on Mars without being detected from earth during years in which Mars was far from earth during the dust storm season. Planet-encircling storms were absent during the dust storm seasons monitored during several favorable oppositions prior to 1956 and after 1986. The change of a planet-encircling dust storm occurring in any arbitrary Mars year is estimated to be approximately one in three, if this occurrence is random from year to year and yet restricted seasonally to southern spring and summer.
Martin Jeremy L.
Zurek Richard W.
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