Other
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000phdt.........8c&link_type=abstract
Thesis (PhD). THE UNIVERSITY OF TOLEDO, Source DAI-B 61/03, p. 1448, Sep 2000, 99 pages.
Other
Scientific paper
The Mars Orbiter Camera on board the Mars Global Surveyor from March 9, 1999 (Ls = 107.27°, the areocentric longitude of the Sun measured in degrees from Mars' northern spring equinox) to December 14,1999 (Ls = 262.78°) has obtained daily global maps of the Martian surface at a resolution of 7.5 km/pixel in two wavelength bands: violet (400-450 nm) and red (575-625 nm). Visual inspection of these maps during the 1999 dust storm season has resulted in the detection of 764 dust storms, ranging in size from ``local'' (>102 km2) to ``regional'' (>106 km2) storms. No global storms occurred during the 1999 dust storm season. Relative dust opacities for 117 out of 763 events were calculated in the red wavelength band. Dust optical depths range from 0.54 ``diffuse haze'' to 2.13 ``concentrated local events''. The numbers of dust storms occurring in the two hemispheres were more nearly equal than previously shown, with the southern hemisphere still having more with 435 (57.0%) storms than the northern hemisphere with 328 (43.0%). We suggest that this difference is due to the limited spectral coverage of the daily global maps from Ls = 135.48° to 150.50°, a time of greater northern dust storm activity. Observations show that dust storms occur in several regions on Mars: near the two polar cap edges, near the north polar hood during northern fall, and at mid- latitude regions in both hemispheres. Specific regions such as Solis Planum and Hesperia, which were regions of significant dust activity in the past, showed almost no dust storm activity in 1999, suggesting that regional dust sources are variable over at least a 20 year period. One region of exceptional activity not noted in previous studies (due to limited temporal coverage) was the Amazonis/Arcadia border near Olympus Mons Auroele. However, other regions such as: Elysium near Elysium Mons, Acidalia, Chryse, north of Valles Marineris, Hellas, Noachis, Argyre, Cimmeria, and Sirenum again were active dust storm regions.
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