Polar Cap Potential Saturation During the Bastille Day Storm

Details Polar Cap Potential Saturation During the Bastille Day Storm Polar Cap Potential Saturation During the Bastille Day Storm

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm42d..05r&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM42D-05

Physics

2431 Ionosphere/Magnetosphere Interactions (2736), 2463 Plasma Convection, 2704 Auroral Phenomena (2407), 2788 Storms And Substorms

Scientific paper

The Bastille Day (July 14/15, 2000) geomagnetic storm was one of the strongest of this solar cycle. It's hallmark characteristic is the extremely strong southward IMF Bz that at one point reached values near -60 nT, and the high solar wind speed that reached values around 1100 kms-1. Simple regression formulas would have predicted a cross polar cap potential of the order of 1000 kV, yet the observed values reach only about 300 kV in the northern hemisphere. A global simulation predicts only slightly higher values. Examination of the simulation shows that the dayside magnetopause is extremely compressed and eroded. As a consequence, the subsolar reconnection region becomes partially shielded from the magnetosheath flow. Thus, Poynting flux towards the reconnection site becomes limited, which in turn limits magnetospheric and ionospheric convection.

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