Penetration of the convection and overshielding electric fields to low latitude ionosphere during the main phase of geomagnetic storms

Details Penetration of the convection and overshielding electric fields to low latitude ionosphere during the main phase of geomagnetic storms Penetration of the convection and overshielding electric fields to low latitude ionosphere during the main phase of geomagnetic storms

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa33c..07k&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA33C-07

Physics

[2409] Ionosphere / Current Systems, [2411] Ionosphere / Electric Fields, [2415] Ionosphere / Equatorial Ionosphere, [2788] Magnetospheric Physics / Magnetic Storms And Substorms

Scientific paper

The convection electric field is significantly enhanced in the magnetosphere by the southward interplanetary magnetic field (IMF) during storm main phase, which transmits to the polar ionosphere accompanying the Region-1 field-aligned currents (R1 FACs) and then to the low latitude ionosphere near-instantaneously by the Earth-ionosphere waveguide. The convection electric field drives DP2 currents in the global ionosphere, intensifying the eastward electrojet (EEJ) at the dayside dip equator and causing dramatic changes in the F-region ionosphere at low latitude and equator. The electric field is further transmitted into the inner magnetosphere, causing ring currents and the R2 FACs responsible for the shielding/overshielding electric field at low latitude. As a result, the counterelectrojet (CEJ) appears at the dayside dip equator at the beginning of storm recovery phase, when the convection electric field decreases substantially because of the decrease in the southward IMF. In this paper, we show that the CEJ occurred during the storm main phase as the convection electric field was increasing under a condition of steady southward IMF. We found that substorm signatures were associated with the CEJ, indicating that the shielding electric field was so strong as to overwhelm the convection electric field at low latitude. It is suggested that the substorm started with intensified R2 FACs, which flow into the global ionosphere and drive the CEJ at the dayside dip equator.

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