Polar cap potential response to solar wind driving

Details Polar cap potential response to solar wind driving Polar cap potential response to solar wind driving

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm41d..06l&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM41D-06

Physics

2704 Auroral Phenomena (2407), 2721 Field-Aligned Currents And Current Systems (2409), 2753 Numerical Modeling, 2788 Magnetic Storms And Substorms (7954), 2790 Substorms

Scientific paper

The polar cap potential response to varying solar wind driving conditions is examined using observations and global MHD simulation results. Several earlier studies have shown that during weak driving, the polar cap potential responds linearly to the driving solar wind electric field, but that saturation occurs at larger values that limit the polar cap potential growth. The Lyon - Fedder - Mobarry global MHD simulation code was run for three events, one substorm, one steady convection event, and one sawtooth event. In each case, the driving solar wind and IMF were relatively constant, which allow for reliable examination of the polar cap potential, its saturation, and the global dynamic consequences in the magnetosphree - ionosphere system. We compare the polar cap potential patterns from the simulations with observations and empirical model results. These comparisons as well as comparisons of in-situ magnetospheric observations and the MHD simulation results in the magnetosphere are used to discuss how the polar cap potential pattern is related to the energy input to the magnetosphere and to the global dynamical evolution of the coupled system.

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