Correlative Study of Ionopsheric Low-Latitude Electric Fields with EUV Images of the Plasmasphere

Details Correlative Study of Ionopsheric Low-Latitude Electric Fields with EUV Images of the Plasmasphere Correlative Study of Ionopsheric Low-Latitude Electric Fields with EUV Images of the Plasmasphere

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa23a..03l&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SA23A-03

Physics

2411 Electric Fields (2712), 2712 Electric Fields (2411), 2768 Plasmasphere

Scientific paper

ROCSAT-1 ion drift meter and retarding potential analyzer measurements have been used to deduce low-latitude (< 35°) convective electric fields in the ionosphere. In this paper signatures of convective electric fields are compared with simultaneous EUV images of the plasmasphere from the IMAGE satellite during the recovery phase of the magnetic superstorm from 0200 - 0700 UT on July 16, 2000. The nightside profile of electric fields contains features of localized enhancement in both zonal and radial electric fields in association with density depletion and enhancement structures. EUV images have indicated the presence of plasmasphere plumes in the dusk sector from 0200 till 0530 UT and absence of plumes afterward. Through the recovery phase the radial electric field was greatly enhanced in the dayside sector and dropped off rapidly with local time in the dusk sector. The magnitude of electric fields also decreased with time, more noticeably for the radial component. For comparison with EUV images of the plasmasphere, signatures of electric fields are mapped to the equatorial plane in the inner magnetosphere. Based on the comparison, we suggest that creation of plasmaspheric plumes may depend on the ratio of zonal to radial electric fields.

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