HR: 1330h
AN: SM32A-1145    [PDF]
TI: Vorticity Change in the Magnetosphere: A Study with Particle Guiding Center Motion
AU: * Huang, T
EM: ts_huang@pvamu.edu
AF: Prairie View A\&M University Prairie View Solar Observatory, PO Box 307, Prairie View, tx 77446 United States
AU: Le Sager, P
EM: philippe_lesager@pvamu.edu
AF: Prairie View A\&M University Prairie View Solar Observatory, PO Box 307, Prairie View, tx 77446 United States
AB: The generation of field-aligned current in the magnetosphere has been ascribed to dynamic changes of vorticity for at least two cases: the quiet time aurora of region R1 (Sato and Iijima, 1979) and the substorm onset (Hasegawa and Sato, 1979). From the point of view of particle guiding center motion the temporal change of vorticity is directly related to the polarization drift. In the guiding center formalism, it consists of five terms. We examine the contribution of each term to the change of vorticity. A distorted dipole (Stern, 1976) is adopted to model the magnetic field in the magnetosphere. This field is easily made time-dependent to simulate a dipolarization of the field, and its Euler potentials have an analytic expression. For numerical calculations, typical values of electric field and plasma density are used.
DE: 2708 Current systems (2409)
DE: 2730 Magnetosphere--inner
DE: 2740 Magnetospheric configuration and dynamics
SC: SPA - Magnetospheric Physics [SM]
MN: 2003 Fall Meeting