Polar Cap Potential Drop as a Function of Solar Wind and Interplanetary Magnetic Field: Results from SuperDARN Convection Measurements

Details Polar Cap Potential Drop as a Function of Solar Wind and Interplanetary Magnetic Field: Results from SuperDARN Convection Measurements Polar Cap Potential Drop as a Function of Solar Wind and Interplanetary Magnetic Field: Results from SuperDARN Convection Measurements

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72b0621b&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM72B-0621

Physics

2760 Plasma Convection, 2776 Polar Cap Phenomena, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

Observations from the Super Dual Auroral Radar Network (SuperDARN) radars were used to generate convection patterns with a temporal resolution of 10 minutes. These convection patterns are derived from direct measurement of plasma flows and do not depend on models of the ionospheric conductance. They therefore provide for the most direct way of determining the ionospheric convection pattern with high temporal resolution. Linear regression analysis was used to compare the polar cap potential drop determined from the SuperDARN convection patterns with various combinations of the solar wind velocity and density and the IMF. In addition, multi-linear regressions for different combinations of parameters were performed. The analysis has been done for the total polar cap potential drop as well as for the dawn and dusk convection cells separately. The multi-linear regression combination of VBz and VBy provides the greatest reduction in the variance. The multi-regression coefficients showed a seasonal dependence. The ground-state of the potential drop was found to be approximately 30 kV on average, with a somewhat higher value in summer and lower value in winter. This seasonal dependence is opposite to that found in a number of previous studies.

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