Physics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9611501l&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, July 1, 1991, p. 11,501-11,512. NSERC-supported research.
Physics
14
Earth Magnetosphere, Geomagnetic Tail, Plasma Layers, Space Plasmas, Asymmetry, Diurnal Variations, Magnetosphere-Ionosphere Coupling
Scientific paper
The initial phase of an investigation of the properties of the magnetotail central plasma sheet in terms of its convective drift together with the bipolar drifts associated with gradients and curvature of the magnetotail magnetic field is described. Emphasis is given to the E x B convection of a thermal plasma in the MHD approximation. The dawn-dusk asymmetry in the magnetosphere generally leads to an azimuthally asymmetric ionospheric convection with close resemblance to the streamline structure first identified by Heppner (1977). The field-aligned current associated with the asymmetry has a strong effect in shielding the inner magnetosphere, in which the imposed electric field decreases exponentially for polytropic indices greater than one. The asymmetry also affects the location of the inner edge of the plasma sheet. A simplified model is presented using an analytic paradigm to depict the general properties of the asymmetry-induced effects.
Liu Wende
Rostoker Gordon
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