Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p51b1416b&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P51B-1416
Physics
5400 Planetary Sciences: Solid Surface Planets, 5405 Atmospheres (0343, 1060), 5410 Composition (1060, 3672), 5465 Rings And Dust, 6225 Mars
Scientific paper
Dust charging studies using Mars soil simulant suggest that the triboelectric charging of dust observed within terrestrial dust disturbances is also very likely on Mars. Most charging occurs within the first few centimeters of the surface; some of these grains are then injected further into the air where they are transported upward by atmospheric currents. Differential transport and gravitational sedimentation sorts the dust devil aerosols by size so that the lighter and predominantly negatively charged particles populate the higher portion of the disturbance while the heavier, positively charged particles fall to the ground or remain in the lower portion of the vortex. We have modified the Mars Regional Atmospheric Modeling System (MRAMS) to include charge distribution as a function of dust particle size and composition. An analytic representation of the charge distribution is derived based on the individual particle charge values provided by the Macroscopic Triboelectric Simulation (MTS) code. Initial model results will be presented covering a range of parameter space including wind speed and shear, dust size distribution at the surface, Weibull wind speed PDF distribution width, and dust composition.
Barth Erika L.
Farrell William M.
Rafkin Scot C.
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