Statistical Study of the Response of the Transpolar Potential to Solar Wind Dynamic Pressure Fronts as a Function of their Pressure Change and Accompanying IMF

Details Statistical Study of the Response of the Transpolar Potential to Solar Wind Dynamic Pressure Fronts as a Function of their Pressure Change and Accompanying IMF Statistical Study of the Response of the Transpolar Potential to Solar Wind Dynamic Pressure Fronts as a Function of their Pressure Change and Accompanying IMF

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm53a1665b&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM53A-1665

Mathematics

Logic

2704 Auroral Phenomena (2407), 2712 Electric Fields (2411), 2760 Plasma Convection (2463), 2776 Polar Cap Phenomena, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

The significant effect of solar wind dynamic pressure fronts on the state on the magnetosphere has been amply demonstrated in recent years. Sudden enhancements in solar wind dynamic pressure have been shown to lead to increased ionospheric convection at high latitudes. Defense Meteorological Satellite Program (DMSP) measurements have shown that solar wind dynamic pressure enhancements significantly increase the transpolar potential and the solar wind/magnetosphere coupling efficiency. Case studies of long-duration solar wind pressure steps indicate that the potential first rises in response to the increase in pressure, but gradually subsides a few hours later despite the solar wind pressure remaining high. It has also been shown in the past that the geoeffectiveness of solar wind pressure fronts depends on the background Interplanetary Magnetic Field (IMF) conditions. Another factor that can affect their geoeffectiveness is the magnitude of pressure change (absolute or relative). We use DMSP flow observations to conduct a statistical study of the effect of solar wind dynamic pressure fronts on the transpolar potential as a function of the pressure change and accompanying IMF. Our results, consistent with the individual case studies, show that the transpolar potential increases after the increase in pressure, reaching a maximum 2-3 hours after impact. It then falls again within one hour perhaps to slightly higher values than before the pressure enhancement. The potential response is faster under southward IMF conditions. The potential changes also seem to be slightly larger but slower to occur for larger absolute magnitude of the pressure increase.

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