Solar-wind influence on MLT dependence of plasma sheet conditions and their effects on storm time ring current formation

Details Solar-wind influence on MLT dependence of plasma sheet conditions and their effects on storm time ring current formation Solar-wind influence on MLT dependence of plasma sheet conditions and their effects on storm time ring current formation

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3414112c&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 14, CiteID L14112

Physics

6

Magnetospheric Physics: Magnetosphere: Inner, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Ring Current, Magnetospheric Physics: Magnetic Storms And Substorms (7954)

Scientific paper

By applying plasma sheet boundary conditions based on averages of Geotail data to a magnetically self-consistent ring current simulation model, we investigate how solar-wind influence on plasma sheet conditions affects local-time asymmetries in early ring current development under two representative interplanetary conditions: (1) For strongly northward interplanetary magnetic field (IMF), high solar-wind density, and low solar-wind speed, Geotail ion densities are high and ion temperatures are low, particularly in the post-midnight quadrant at radial distances r > 8 R E; and (2) For weakly northward IMF, high solar-wind speed, and low solar-wind density, a significant density enhancement is not observed in the post-midnight at r > 8 R E. Within an hour after an increase in the convection electric field, Condition (1) lead to relative enhancement of the simulated ring current plasma pressure especially in the post-midnight quadrant, while Condition (2) lead to pressure enhancements that are more uniformly distributed around the night side.

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