Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa21a..12w&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SA21A-12
Physics
2411 Electric Fields (2712), 2443 Midlatitude Ionosphere, 2463 Plasma Convection, 2788 Storms And Substorms
Scientific paper
Although the inner edge of the plasma sheet tends to shield the mid- and low-latitude ionosphere from the full force of magnetospheric convection, the shielding is particularly ineffective during magnetic storms. This talk will review several effects that represent quick responses to magnetospheric drivers, specifically the following: 1. Overshielding and undershielding. The overshielding electric fields, which occur during convection decreases, were predicted theoretically and observed in the post-midnight sector more than twenty years ago. The predicted patterns have been largely confirmed by statistical analysis of radar observations, although it has been necessary to modify the original overshielding idea somewhat to be consistent with the observed strength and duration. Overshielding has also been seen in plasmaspheric observations, most recently by the IMAGE spacecraft. Simulations of the main phase of a large storm predict the sustained presence of an undershielding (direct penetration) eastward electric field in the post-dusk sector, possibly triggering scintillations there. 2. Polarization jets. Simulations indicate that strong ring current injection is accompanied by a several-degree-wide westward-moving jet of plasma in the dusk-midnight quadrant, just equatorward of the auroral zone. These have been observed in recent years from CRRES and Millstone Hill. 3. Interchange-associated electric-field eddies. These are predicted by recent Rice Convection Model simulations and have not, as far as we know, been reported observationally. We predict their occurrence in the early recovery phase of a magnetic storm whose main phase terminates with a strong and sustained northward turning of the interplanetary magnetic field. They should occur in a band roughly 5 degrees wide, just equatorward of the auroral zone, in the dusk-midnight sector.
Garner T. W.
Goldstein Jeffrey Jay
Sazykin Stanislav
Spiro Robert W.
Wolf Richard A.
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