Effects of the Solar Wind and Ionospheric Conductance on the Transpolar Potential and Magnetosheath Flow: Global MHD Modeling

Details Effects of the Solar Wind and Ionospheric Conductance on the Transpolar Potential and Magnetosheath Flow: Global MHD Modeling Effects of the Solar Wind and Ionospheric Conductance on the Transpolar Potential and Magnetosheath Flow: Global MHD Modeling

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm41d..06m&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM41D-06

Physics

2708 Current Systems (2409), 2736 Magnetosphere/Ionosphere Interactions, 2753 Numerical Modeling, 2776 Polar Cap Phenomena, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

The behavior of the magnetosphere-ionosphere system under the influence of a strong solar wind electric field is studied using global MHD simulations. The simulations indicate the saturation of the transpolar potential for high values of IEF. However, the saturation level is strongly affected by the level of ionospheric conductance. A mechanism of the ionospheric conductance feedback on the magnetosheath flow is presented. The mechanism describes a chain of events from the ionosphere to the magnetopause and to the magnetosheath and shows that the dayside reconnection potential, and consequently the transpolar potential, are determined by the interplay between the ionospheric conductance, magnetopause shape, magnetosheath flow and bow shock stand off distance. Effects of the solar wind dynamic pressure are discussed along with the effect of the ionospheric conductance, and the latter is shown to be dominant.

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