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Polar regions on Mars observed by the HRSC experiment on Mars Express

Hoffmann, Harald and Bucher, Tilman and Gwinner, Klaus and Jaumann, Ralf and Scholten, Frank and Stephan, Katrin and van Gasselt, Stephan and Neukum, Gerhard and Markiewicz, Wojciech J. and Poulet, Francois and HRSC Co-Invstigator Team, (2005) Polar regions on Mars observed by the HRSC experiment on Mars Express. European Geosciences Union, General Assembly 2005, 2005-04-24 - 2005-04-29, Wien (Austria).

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Abstract

Already early during commissioning, the High Resolution Stereo Camera (HRSC) experiment on Mars Express acquired images of the south polar region away from periapsis yielding a spatial resolution of about 50 to 80 m/pixel. Special emphasis was given to obtain multispectral data at highest possible spatial resolution while stereo data were not acquired. A complete mapping campaign of the south polar region in stereo and color is planned at the end of the nominal mission. Because of the wide range in illumination conditions, the observation in orbit 103 (solar longitude 348) was also used as a test case for a first-order photometric correction. Atmospheric phenomena detected in this orbit include a dust cloud at the edge of the polar cap and the presence of haze close to the terminator. The OMEGA imaging spectrometer onboard Mars Express identified three different units in the south polar cap with a CO<sub>2</sub>-ice rich unit mixed with some water ice, an H<sub>2</sub>O-ice rich unit with some CO<sub>2</sub>-ice on the scarps around the residual cap, and a unit consisting of dust mixed with H<sub>2</sub>O-ice but without CO<sub>2</sub>-ice. All three units described by OMEGA could be recognized within the HRSC image based on their differences in albedo. The HRSC color data allowed to map and differentiate these units in greater detail. Within the CO<sub>2</sub>-ice rich residual cap, two different terrains can be distinguished with a brighter, rough terrain and a smooth, slightly bluish terrain exhibiting the highest occurrence of swiss-cheese like features, indicating differences in their sublimation stages. A mapping campaign of the Martian north polar region has started in December 2004, again from higher altitudes and with a spatial resolution of 60 m/pixel. Meanwhile, the periapsis has drifted further north and spatial resolutions of up to 15 m/pixel will be acheved. First results of the north polar observations will be presented that include the presence of clouds and changes in the ice coverage, the polar layered deposits and circumpolar eolian processes.

Document Type:Conference or Workshop Item (Speech)
Title:Polar regions on Mars observed by the HRSC experiment on Mars Express
Authors:
AuthorsInstitution or Email of Authors
Hoffmann, HaraldUNSPECIFIED
Bucher, TilmanUNSPECIFIED
Gwinner, KlausUNSPECIFIED
Jaumann, RalfUNSPECIFIED
Scholten, FrankUNSPECIFIED
Stephan, KatrinUNSPECIFIED
van Gasselt, StephanFreie Universität Berlin
Neukum, GerhardFreie Universität Berlin
Markiewicz, Wojciech J.MPS Katlenburg-Lindau
Poulet, FrancoisIAS Paris, F
HRSC Co-Invstigator Team, UNSPECIFIED
Date:2005
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Mars, Mars Expres, polar regions
Event Title:European Geosciences Union, General Assembly 2005
Event Location:Wien (Austria)
Event Type:international Conference
Event Dates:2005-04-24 - 2005-04-29
Organizer:EGU
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EW - Erforschung des Weltraums
DLR - Research area:Space
DLR - Program:W EW - Erforschung des Weltraums
DLR - Research theme (Project):W - Projekt MARS-EXPRESS / HRSC (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Institute of Planetary Research > Planetary Geology
Deposited By: Harald Hoffmann
Deposited On:23 Jan 2006
Last Modified:27 Apr 2009 04:56

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