On the azimuthal variation of core plasma in the equatorial magnetosphere

Details On the azimuthal variation of core plasma in the equatorial magnetosphere On the azimuthal variation of core plasma in the equatorial magnetosphere

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jgr...10023597g&link_type=abstract

Journal of Geophysical Research, Volume 100, Issue A12, p. 23597-23606

Physics

26

Magnetospheric Physics: Plasmasphere, Magnetospheric Physics: Electric Fields, Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Plasma Convection

Scientific paper

Previous results of plasmapause position surveys have been synthesized into a description of the underlying global distribution of plasmasphere-like or core plasma densities unique to a steady state magnetosphere. Under these steady conditions, the boundary between high- and low-density regions is taken to represent the boundary between diurnal near-corotation and large-scale circulation streamlines that traverse the entire magnetosphere. Results indicate a boundary that has a pronounced bulge in the dusk sector that is rotated westward and markedly reduced in size at increased levels of geomagnetic activity (and presumably magnetospheric convection). The derived profile is empirical confirmation of an underlying ``tear drop'' distribution of core plasma, which is valid only for prolonged steady conditions and is somewhat different from that associated with the simple superposition of sunward flow and corotation, both in its detailed shape and in its varying orientation. Variation away from the tear drop profile suggests that magnetospheric circulation departs from a uniform flow field, having a radial dependence with respect to the Earth that is qualitatively consistent with electrostatic shielding of the convection electric field and which is rotated westward at increased levels of geophysical activity.

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