A Coupling Function Linking Solar Wind /IMF Variations and Geomagnetic Activity

Details A Coupling Function Linking Solar Wind /IMF Variations and Geomagnetic Activity A Coupling Function Linking Solar Wind /IMF Variations and Geomagnetic Activity

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm31a0298l&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM31A-0298

Other

2431 Ionosphere/Magnetosphere Interactions (2736), 2435 Ionospheric Disturbances, 2712 Electric Fields (2411), 2721 Field-Aligned Currents And Current Systems (2409), 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

From a theoretical consideration we have obtained expressions for the coupling function linking solar wind and IMF parameters to geomagnetic activity. While deriving these expressions, we took into account (1) a scaling factor due to polar cap expansion while increasing a reconnected magnetic flux in the dayside magnetosphere, and (2) a modified Akasofu function for the reconnected flux for combined IMF Bz and By components. The resulting coupling function may be written as Fa = aVsw B^1/2 sina (q/2), where Vsw is the solar wind speed, B^ is the magnitude of the IMF vector in the Y-Z plane, q is the clock angle between the Z axis and IMF vector in the Y-Z plane, a is a coefficient, and the exponent, a, is derived from the experimental data and equals approximately to 2. The Fa function differs primary by the power of B^ from coupling functions proposed earlier. For testing the obtained coupling function, we used solar wind and interplanetary magnetic field data for four years for maximum and minimum solar activity. We computed 2-D contour plots for correlation coefficients for the dependence of geomagnetic activity indices on solar wind parameters for different coupling functions. The obtained diagrams showed a good correspondence to the theoretic coupling function Fa for a »2. The maximum correlation coefficient for the dependence of the polar cap PC index on the Fa coupling function is significantly higher than that computed for other coupling functions used researchers, for the same time intervals.

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