Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p51e..04b&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P51E-04
Physics
[5405] Planetary Sciences: Solid Surface Planets / Atmospheres
Scientific paper
Mars analog and laboratory studies and field campaigns on Earth provide strong evidence for the existence of active electrodynamic processes on Mars. Dust charging studies using Mars soil simulant suggest that the triboelectric charging of dust observed within terrestrial dust disturbances is very possible on Mars. Recent microwave detection of a lightning signature correlated with a Martian dust storm suggests large electric fields do exist. We have developed a physically consistent model of triboelectric dust charging and atmospheric dynamics by coupling the Microscopic Triboelectric Simulator (MTS) with the Mars Regional Atmospheric Modeling System (MRAMS). We have used the combined model to simulate the dynamics of charged particles in Martian dust devils and examine the resulting electric field environment. We have shown that the mixing of negatively charged (metallic) and positively charged (basaltic) particles within a dust devil typically results in electric fields of order a few kV/m. In some cases, brief periods (few minutes) of much higher electric fields, 10s - 100s kV/m, are seen.
Barth Erika L.
Farrell William M.
Rafkin Scot C.
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