The Time Evolution of Cryptic Region Using MOC and HiRISE Data

Details The Time Evolution of Cryptic Region Using MOC and HiRISE Data The Time Evolution of Cryptic Region Using MOC and HiRISE Data

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.1503j&link_type=abstract

American Astronomical Society, DPS meeting #40, #15.03; Bulletin of the American Astronomical Society, Vol. 40, p.410

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The distribution of the Martian south polar cap is not symmetric during the springtime retreat. Sublimation of the CO2 ice layer in the summer time will leave only the residual ice caps at the poles. The other side, called "Cryptic Region” on the South Pole between 500 and 2100 longitude, is characterized by low albedo and low surface temperature. There are several special surface features in the cryptic region, for example, spider, fans, and Dalmatian spots according to the MOC observations. A complex of fan-shaped features and spider-like features of km-scale were found to be appeared and disappeared in a repeatable manner from cycle to cycle. The fan-shaped and spider-shaped features are basically the imprints of surface wind pattern. We have used the high-resolution images from the Mars Orbiter Camera (MOC) and the High Resolution Image Science Experiment from the Mars Reconnaissance to study the time distribution of these localized small-scale structures. We found that during the warming period starting at Ls 180o in the south hemisphere, the seasonal ice cap regresses and fans and spiders appear in sequence. The fan-shaped features tend to appear in early spring and the spider-shaped features in late Spring.

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