Identification of present fluid seepage in Nirgal Vallis, by comparing Mars Global Surveyor and Mars Odyssey images

Details Identification of present fluid seepage in Nirgal Vallis, by comparing Mars Global Surveyor and Mars Odyssey images Identification of present fluid seepage in Nirgal Vallis, by comparing Mars Global Surveyor and Mars Odyssey images

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja....12651a&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #12651

Computer Science

Scientific paper

There is consensus that seepage of fluids occurred through Martian layers, with formation of channels and gullies that are much similar to those on Earth. However, it is not yet firmly established whether the seeping fluid was liquid water or not. Also, the time frame of these events is undefined. In the present work we address this latter issue, by comparing images that were acquired in two different missions: Mars Global Surveyor (MGS) and Mars Odyssey (MO). A comparison of image V01138003, obtained by the THEMIS camera onboard the MO spacecraft on March 18, 2002 (1) and image MOC2-240, obtained by the Mars Orbiter Camera onboard the MGS spacecraft on July 12, 1999 (2), shows a new gully on the northern scarp of Nirgal Vallis, near 29.7°S, 321.4°E, among previously existing gullies, with discernible formation of an incipient fan-shaped apron. This shows that fluid outflow is happening in the present. The fact that the THEMIS image is of medium-resolution (18 m/pixel) does not allow seeing many details on the new gully. This spot is consequently a good candidate for image acquisition by the Mars Express HRSC camera that will have a maximum resolution of 2.3 m/pixel, with the further advantage of stereoscopic vision. 1. Arizona State University 2. Malin Space Science Systems

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