Other
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009jbaa..119..123m&link_type=abstract
Journal of the British Astronomical Association, vol.119, no.3, p.123-143
Other
Scientific paper
The highlight of this opposition was the outbreak of a planet-encircling dust storm in 2001 June, almost as obscuring and long-lasting as that of 1971, which set a new record as the seasonally earliest such event. Visual, imaging and polarimetric data demonstrate the presence of airborne dust for around 159 successive days. Atypically, the N. polar hood did not disappear during the storm, and instead showed considerable activity. Viewed before the storm, the albedo features showed little or no changes from 1999, but during and following the storm at least a dozen changes took place. These changes included the following: Syrtis Major became narrower to the NW, Moeris Lacus developed, NW Mare Sirenum and Pandorae Fretum darkened, Phasis reappeared, Claritas-Daedalia darkened and Solis Lacus became smaller with an altered orientation. Dust fallout brightened E. Syria and Ausonia Borealis, thinning Mare Tyrrhenum to the north of the latter. The Equatorial Cloud Band and the orographic clouds over Olympus Mons and the Tharsis Montes were followed from 2000 December till 2001 April and June respectively. Seasonal white cloud activity resumed from 2001 October as the dust storm subsided. Short-lived "flashes" located in Edom were recorded on 2001 June 7 and 8, when the sub-Earth and subsolar latitudes coincided, due to specular reflection from near-horizontal ground ice/hydrated mineral deposit or other smooth surfaces. These events had been predicted from seasonally similar observations made in 1954. A further flash on June 16 was located further south near Hellespontus Montes, another region found to have an historical precursor for such an event.
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