Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p51a1413b&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #P51A-1413
Physics
[2409] Ionosphere / Current Systems
Scientific paper
Recent studies based on Mars Global Surveyor magnetic field measurements have indicated stratified ionospheric conductivity layers in the Martian ionosphere. The ionospheric Hall conductivity peaks between 130-140 km whereas the Pedersen conductivity profile is double peaked, with a high altitude peak located between 180-200 km, and a lower, typically much stronger peak between 120-130 km. Model results suggest that the lower altitude Pedersen conductivity layer is only found in regions of draped (induced) magnetic field and negligible crustal magnetic field. The resulting strong conductivity gradients are expected to strongly influence the electrodynamics of the Martian ionosphere and, by controlling the closure of currents, modulate solar wind-ionosphere coupling. In this study we combine realistic global magnetic field, atmospheric, and ionospheric models in order to estimate the planetary distribution of ionospheric conductivity. This enables us to investigate the spatial variations in both the vertical and horizontal directions, and the electrodynamic implications.
Beharrell M.
Lester Mark
Opgenoorth Hermann J.
Wild James A.
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