Other
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p23a1229s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #P23A-1229
Other
[5460] Planetary Sciences: Solid Surface Planets / Physical Properties Of Materials, [5462] Planetary Sciences: Solid Surface Planets / Polar Regions, [5494] Planetary Sciences: Solid Surface Planets / Instruments And Techniques, [6225] Planetary Sciences: Solar System Objects / Mars
Scientific paper
Terrain investigated by the Phoenix Mars Lander during northern summer (Ls 77° to 151°) differs greatly from the other five sites explored on Mars; there are comparatively few rocks and little evidence of aeolian processes. The site consists of a layer (on average, ~5 cm deep) of loose, relatively ice-free soil underlain by hard, icy soil. The strength of the loose soil in the top layer is affected by its adsorbed water and/or pore ice content which are enhanced with proximity to the underlying icy soil. The Robotic Arm (RA) on Phoenix returned force values (after conversion from motor currents); analysis and interpretation of these force values provides the best information about the shear strength of loose soil at the landing site. Principal interactions of the RA with soil include: trenching, Thermal and Electrical Conductivity Probe insertions, scraping, and acquiring samples. We present a selection of these interactions and their results, including the relevance to soil properties. For example, over a lateral distance of 30 cm, cohesion may vary from 0-1.5 kPa depending on proximity to icy soil.
Arvidson Ray E.
Mellon Michael T.
Shaw Amy
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