Study of the Polar Cap Potential Under Conditions of Large Solar Wind Ram Pressures

Details Study of the Polar Cap Potential Under Conditions of Large Solar Wind Ram Pressures Study of the Polar Cap Potential Under Conditions of Large Solar Wind Ram Pressures

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsa72b0542z&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SA72B-0542

Physics

2407 Auroral Ionosphere (2704), 2409 Current Systems (2708), 2411 Electric Fields (2712), 2431 Ionosphere/Magnetosphere Interactions (2736), 2447 Modeling And Forecasting, 2475 Polar Cap Ionosphere 2736 Magnetosphere/Ionosphere Interactions, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

It is generally accepted that the magnitude of the potential drop in the ionospheric polar cap is predominately determined by the interplanetary magnetic field's (IMF) magnitude and orientation. However recent work by Ridley et al. (2002) shows that under extreme conditions of large ram pressures from the solar wind the ram pressure can play a significant role, resulting in potentials larger than predicted by the IMF alone. We have examined the 1998-2001 period of ACE data and identified about 70 events of unusually high ram pressure caused by the solar wind ion density being greater than 30 ions/cc (nominally it is around 5 ions/cc). We have examined the resulting ionospheric potentials observed by the DMSP spacecraft during these events. We compare the observed potentials to the predictions from the models. Excess potentials are examined as a function of both the ram pressure and the IMF orientation.

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