Superposed epoch analysis of storm-time electric fields in the inner magnetosphere

Details Superposed epoch analysis of storm-time electric fields in the inner magnetosphere Superposed epoch analysis of storm-time electric fields in the inner magnetosphere

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm11a1558m&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM11A-1558

Physics

[2712] Magnetospheric Physics / Electric Fields, [2730] Magnetospheric Physics / Magnetosphere: Inner, [2788] Magnetospheric Physics / Magnetic Storms And Substorms

Scientific paper

The electric field is a key quantity to understand plasma dynamics in the inner magnetosphere especially during magnetic storms. In this study, we perform a superposed epoch analysis of electric fields with an epoch time at Dst minimum using Cluster data. The radial distances examined are <6 Re and magnetic latitude range is within 25 degrees from the magnetic equator. Electric fields at all magnetic local times are enhanced around Dst minimum. Such large electric fields at the nightside are related to dipolarization signatures and decreases in the AL index when we check individual events. Large electric field variation simultaneously measured during a dipolarization is consistent with it being inductive fields. Some other large electric fields are not accompanied by magnetic signatures. Directions of electric fields are different during the main phase and the recovery phase, which is interpreted in terms of the location of the Harang discontinuity. Large electric fields at the duskside are related to subauroral polarization stream.

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