Polar-equatorial ionospheric electric field and currents driven by the Region-2 field-aligned currents during storm/substorms

Details Polar-equatorial ionospheric electric field and currents driven by the Region-2 field-aligned currents during storm/substorms Polar-equatorial ionospheric electric field and currents driven by the Region-2 field-aligned currents during storm/substorms

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa13c..01k&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SA13C-01

Physics

[2409] Ionosphere / Current Systems, [2411] Ionosphere / Electric Fields, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2721] Magnetospheric Physics / Field-Aligned Currents And Current Systems

Scientific paper

The dawn-to-dusk convection electric field increases during the substorm growth phase and storm main phase, driving DP2 currents composed of two-cell current vortices in high latitude and eastward electrojet at the dayside dip equator. The electric field and currents are often reversed in direction to the normal DP2 currents at subauroral to equatorial latitudes when the convection electric field reduces substantially during the substorm expansion phase and storm recovery phase [Kikuchi et al., 2000, 2008]. The reversed current at the dayside dip equator appears as a counterelectrojet (CEJ) and causes an equatorial enhancement of the negative bay in the afternoon sector. In this study, we show that the reversed electric field and currents develop at the subauroral-to-equatorial latitudes at the onset of substorms, when the convection electric field increases at auroral latitudes during isolated substorms and stormtime substorms. The CEJ during the storm main phase has been attributed to the disturbance dynamo, but our study suggests that the substorm-associated Region-2 field-aligned currents can be a cause of the CEJ even during the storm main phase.

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