Internal or External? What MHD Simulation Can Say about the Cause of Semiannual Variation in Geomagnetic Activity

Details Internal or External? What MHD Simulation Can Say about the Cause of Semiannual Variation in Geomagnetic Activity Internal or External? What MHD Simulation Can Say about the Cause of Semiannual Variation in Geomagnetic Activity

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm22b..01s&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM22B-01

Physics

2409 Current Systems (2708), 2736 Magnetosphere/Ionosphere Interactions, 2740 Magnetospheric Configuration And Dynamics, 2753 Numerical Modeling, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

To what degree does the semiannual variation of geomagnetic activity result from external causes (e.g., heliographic latitude of the earth or tilt between heliographic and geographic equators) versus internal causes (e.g., north-south asymmetry of ionospheric conductances during solstices)? MHD simulation is well suited to explore the degree of an internal cause since one can vary conductances at will in the two hemisphere separately to see the effect these variations have on indicators of geomagnetic activity such as convection potential. This talk will give the MHD-simulation answer to the question, "Does the convection potential, as measured in the ionosphere, increase or decrease during solstice compared to equinox for the same solar wind conditions (in the GSM coordinate system)?" Moreover, it will compare storm-time activity against moderate activity to show how interhemispheric comparisons of ionospheric electrodynamic parameters can test theories of transpolar potential saturation.

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