HR: 14:35h
AN: SM52D-04    [PDF]
TI: Electrodynamics of Storm Time Auroral Disturbances
AU: * Gjerloev, J W
EM: gjerloev@pop600.gsfc.nasa.gov
AF: NASA-GSFC, CODE 696, Greenbelt, MD 20771 United States
AU: Hoffman, R A
EM: Robert.A.Hoffman.1@gsfc.nasa.gov
AF: NASA-GSFC, CODE 696, Greenbelt, MD 20771 United States
AU: Friel, M
EM: mfriel@gds.org
AF: NASA-GSFC, CODE 696, Greenbelt, MD 20771 United States
AU: Frank, L A
EM: frank@IowaSP.Physics.UIowa.EDU
AF: University of Iowa, Department of Physics and Astronomy, Iowa City, IA 52242-1479 United States
AU: Sigwarth, J B
EM: john-sigwarth@uiowa.edu
AF: University of Iowa, Department of Physics and Astronomy, Iowa City, IA 52242-1479 United States
AU: Greenwald, R A
EM: ray_greenwald@jhuapl.edu
AF: Johns Hopkins Applied Physics Laboratory, Johns Hopkins Road, Laurel, MD 20723-6099 United States
AB: The electrodynamics of magnetic storm-time auroral disturbances is contrasted with the electrodynamics of isolated, classical bulge-type auroral substorms. Global auroral images are used to organize in-situ electrodynamic data from satellites and ground magnetic data from a large array of stations. The distribution of onset locations, the conductance distribution, convection electric field, and the electrojet topology are all analyzed during the development of the main phase magnetic storm. It is found that the onset locations of auroral disturbances are generally later in local time during magnetic storms than for substorms. The convection electrojet throughout the post-midnight region into dawn dominates over the more classical pre-midnight wedge electrojet of substorms and continues over the long period of main phase development. Specific examples and statistical results will be presented, with dominant attention on the electrojet configuration and it relationship to the evolution of the Dst.
DE: 2704 Auroral phenomena (2407)
DE: 2708 Current systems (2409)
DE: 2712 Electric fields (2411)
DE: 2778 Ring current
DE: 2788 Storms and substorms
SC: SPA - Magnetospheric Physics [SM]
MN: 2003 Fall Meeting