Other
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm41a06j&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM41A-06
Other
2778 Ring Current, 2784 Solar Wind/Magnetosphere Interactions, 2788 Storms And Substorms
Scientific paper
Several geomagnetic storms for a variety of interplanetary configurations monitored by the SWE and MFI instruments on the Wind spacecraft are simulated numerically and the stormtime injection and trapping of H+, O+, and He+ ring current ions investigated. We examine effects of the large-scale inner magnetospheric electric field on ring current evolution by inter-comparing results derived from a Volland-Stern type and Weimer convection models. We find that during the main phases of the storms the Volland-Stern model predicts symmetric intensification of the convection electric field to modest values at all L shells. The Weimer model, on the other hand, predicts stronger electric field penetrating to low L shells and localized near dusk. The Weimer model is thus more consistent with previously published stormtime CRRES observations. We compare modeled distribution functions with measurements from the ESIC instrument on Equator-S and the HYDRA instrument on Polar. We find that both convection models reproduce the main trends of ring current evolution and show reasonable agreement with data at larger L shells and on the nightside. However, the simulations using a Volland-Stern model predict wider dips in the ion energy spectra than observed at low L shells on the dayside. Ions follow paths at larger distances from Earth and experience less collisional losses in the Weimer convection model, thus a better agreement with observations on the dayside is usually obtained.
Farrugia Charles J.
Jordanova Vania K.
Kistler Lynn M.
Torbert Roy B.
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