Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm32a1145h&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM32A-1145
Physics
2708 Current Systems (2409), 2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics
Scientific paper
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.
Huang Tao
Le Sager Philippe
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