Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm43b..01r&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM43B-01
Physics
2164 Solar Wind Plasma, 2431 Ionosphere/Magnetosphere Interactions (2736), 2447 Modeling And Forecasting, 2475 Polar Cap Ionosphere, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
We have developed a zero-order model that maps the solar wind electric field at L1 to equatorial latitudes [Rothwell and Jasperse, 2006]. This model combines the solar wind with a sunlit ionosphere and a simplified ring current model to give the penetration electric field at the pre-reversal enhancement, just past the dusk terminator. The region-2 currents are determined in the manner of Siscoe [1982] using a variable time constant. The time profile of the net penetration electric field during a magnetic storm, therefore, depends not only the solar wind, but also on the region-2 currents' rise time. Present estimates of the shielding time range from ~30 minutes [Senior and Blanc, 1984] to ~5 hours [Jaggi and Wolf, 1973]. We will estimate the rise (shielding) times by applying our model to a series of magnetic storms during the 1998-2005 time frame and correlating the shielding time scale with the presence of bubbles as measured on DMSP.
Jasperse John R.
Rothwell Paul L.
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