Response of the convection electric field on southward turning of the IMF

Details Response of the convection electric field on southward turning of the IMF Response of the convection electric field on southward turning of the IMF

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm11a1594n&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM11A-1594

Physics

2712 Electric Fields (2411), 2730 Magnetosphere: Inner, 2736 Magnetosphere/Ionosphere Interactions (2431), 2760 Plasma Convection (2463), 2788 Magnetic Storms And Substorms (7954)

Scientific paper

We have investigated the response of convection electric fields in the inner magnetosphere on southward turning of the interplanetary magnetic field (IMF), and its spatial dependence using the CRRES spacecraft data measured in the inner magnetosphere. When the southward turning of IMF to -20 nT was measured by IMP-8 twice at 3:12 and 5:52 UT, which was accompanied by a storm with the minimum SYM-H of -216 nT, the CRRES spacecraft was located in the dusk inner magnetosphere and detected enhancements of the convection electric field within 1 min after the southward IMF Bz reaches the dayside magnetopause. The amplitude of the electric field is well reproduced by the Weimer model. These results indicate that plasma convection in the inner magnetosphere quickly responds to the energy input from the solar wind to the magnetosphere, and the time variation can be described by simple mapping of two-cell convection in the ionosphere. However, when the spacecraft is located in the midnight sector, convection electric fields do not quickly respond to southward turning of the IMF. CRRES measured a 20 min delay of enhancements of the electric field at 6.6 RE and 21.5 MLT on March 21, 1991. The amplitude is about a half of the Weimer model electric field mapped onto the spacecraft location. A statistical analysis using 165 events of southward and northward turning of the IMF has clarified that the electric field quickly (< 5 min) responds to IMF variations at the earthward of the inner edge of the electron plasma sheet, while it takes more than 30 min in the plasma sheet. This tendency indicates that plasma convection has a different behavior in and earthward of the plasmasheet.

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