Modeled cross-polar cap potential response after sudden IMF changes

Details Modeled cross-polar cap potential response after sudden IMF changes Modeled cross-polar cap potential response after sudden IMF changes

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm53a1667r&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM53A-1667

Other

2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2447 Modeling And Forecasting, 2475 Polar Cap Ionosphere, 7954 Magnetic Storms (2788)

Scientific paper

This paper presents an in-depth study of the response of the cross-polar-cap potential (CPCP) modeled by the Space Weather Modeling Framework (SWMF) when there are sudden changes in the interplanetary magnetic field (IMF). We study the model response to answer how the level of conductance (and other, numerical, parameters) in a model affects the response time after a sudden change of the IMF. In this study we present simulation runs of the global geomagnetic models BATSRUS as part of SWMF with solar wind magnetic field Bz level of 10nT (switching from negative to positive and back to negative) and average solar wind density and solar wind conditions. We use uniform ionospheric Pedersen conductances between 2 and 20 mho and vary a few numerical parameters inside the magnetosphere as well. We generally find that lower conductances and higher numerical resolution combined with a less diffusive numerical scheme give rise to higher levels of oscillations in the magnetosphere-ionosphere system after the IMF change. We also see an increase of the elapsed time until the new level of the CPCP is reached. This study is performed as a model validation at the Community Coordinated Modeling Center.

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