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

Hoffmann, Harald und Bucher, Tilman und Gwinner, Klaus und Jaumann, Ralf und Scholten, Frank und Stephan, Katrin und van Gasselt, Stephan und Neukum, Gerhard und Markiewicz, Wojciech J. und Poulet, Francois und 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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Kurzfassung

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.

Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Polar regions on Mars observed by the HRSC experiment on Mars Express
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Hoffmann, HaraldNICHT SPEZIFIZIERT
Bucher, TilmanNICHT SPEZIFIZIERT
Gwinner, KlausNICHT SPEZIFIZIERT
Jaumann, RalfNICHT SPEZIFIZIERT
Scholten, FrankNICHT SPEZIFIZIERT
Stephan, KatrinNICHT SPEZIFIZIERT
van Gasselt, StephanFreie Universität Berlin
Neukum, GerhardFreie Universität Berlin
Markiewicz, Wojciech J.MPS Katlenburg-Lindau
Poulet, FrancoisIAS Paris, F
HRSC Co-Invstigator Team, NICHT SPEZIFIZIERT
Datum:2005
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:Mars, Mars Expres, polar regions
Veranstaltungstitel:European Geosciences Union, General Assembly 2005
Veranstaltungsort:Wien (Austria)
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2005-04-24 - 2005-04-29
Veranstalter :EGU
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Weltraum (alt)
HGF - Programmthema:W EW - Erforschung des Weltraums
DLR - Schwerpunkt:Weltraum
DLR - Forschungsgebiet:W EW - Erforschung des Weltraums
DLR - Teilgebiet (Projekt, Vorhaben):W - Projekt MARS-EXPRESS / HRSC (alt)
Standort: Berlin-Adlershof
Institute & Einrichtungen:Institut für Planetenforschung > Planetengeodäsie
Institut für Planetenforschung > Planetengeologie
Hinterlegt von: Harald Hoffmann
Hinterlegt am:23 Jan 2006
Letzte Änderung:27 Apr 2009 04:56

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