Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm71a..06k&link_type=abstract
American Geophysical Union, Spring Meeting 2009, abstract #SM71A-06
Physics
2716 Energetic Particles: Precipitating, 2740 Magnetospheric Configuration And Dynamics, 2764 Plasma Sheet, 2778 Ring Current, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
During the 21-22 January 2005 magnetic storm, a highly unusual ring current developed dominantly during northward IMF and high dynamic pressure with minimum pressure-corrected symH less than -100 nT. Early in the storm, a short (less than 1 hour) interval of strong southward IMF produced a brief depression in sym H which had already recovered when the main phase development of the ring current began under northward IMF and sustained high solar wind dynamic pressure. During the ring current development, a hot dense plasma sheet was observed at geosynchronous orbit followed by a cold dense plasma sheet. The movement of these dense plasma sheets through the inner magnetosphere during the high dynamic pressure interval in the solar wind produced the ring current, which began to decay immediately following the end of the cold dense plasma sheet interval. The cross polar cap potential reached a maximum during the interval of strongest southward IMF early in the storm. However, the equatorward edge of the auroral oval (as indicated by the MBI index) moved to lowest latitudes as the hot high-density plasma sheet stretched out the magnetotail. Precipitation of protons and electrons at ring current energies maximized during the peak of the ring current development under northward IMF conditions. A simulation of this magnetic storm event using the BATS-R-US MHD model with an inner magnetosphere module based on the Rice Convection model produces all the main features of this unusual ring current development and, in addition, shows that the solar wind-magnetosphere coupling was different during the hot compared to the cold high density plasma sheet intervals. We present a comparison between observations and model results and explore the processes responsible for this unusual ring current and its decay.
C:son Brandt Pontus
Evans Silvan D.
Fang Xiao
Fok M.-
Gonzalez Walter D.
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