One micron radiometry of Mars from MOLA on MGS

Details One micron radiometry of Mars from MOLA on MGS One micron radiometry of Mars from MOLA on MGS

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....7265z&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #7265

Computer Science

Scientific paper

The Mars Orbiter Laser Altimeter (MOLA) measures the brightness of the surface of Mars at (1.064±0.001) as part of the altimeter detector threshold setting system. The brightness of the surface illuminated by the laser pulse (active radiometry) has been acquired for over 1.5 Mars years. Although MOLA is no longer operating as an altimeter, the detector continues to measure the surface brightness of Mars by reflected sunlight (passive radiometry) over an area of approximately 300 meters x 300 meters, at 8 Hz, continuously along track. These observations provide a very precise, high-resolution measure of the albedo of Mars at 1 micron and show the seasonal change in brightness of the polar regions as the frost line moves toward the pole. The total data record, both active and passive, is presently over 2 martian years and data continue to tbe acquired. These data have been used to provide a record of the change in the size of the frost region around the two polar icecaps as a function of Ls from early 1999 thru' 2002. The data show the change in shape and size of the two regions and are compared with the elevation derived from the altimeter. We show that the passive radiometry may be used as a simple monitor of the effective size of the two icecaps.

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