Low-latitude plasma mantle in the near-Earth magnetosphere: Geotail observations

Details Low-latitude plasma mantle in the near-Earth magnetosphere: Geotail observations Low-latitude plasma mantle in the near-Earth magnetosphere: Geotail observations

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...106.1949t&link_type=abstract

Journal of Geophysical Research, Volume 106, Issue A2, p. 1949-1954

Physics

1

Magnetospheric Physics: Magnetospheric Configuration And Dynamics, Magnetospheric Physics: Magnetotail Boundary Layers, Magnetospheric Physics: Plasma Convection, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

This report provides evidence for the appearance of the plasma mantle at low latitudes, ZGSM~0. A detailed analysis of Geotail observations on January 20, 1996, clarifies the characteristics of the plasma flow in the low-latitude mantle. The tailward flow speed in the mantle is 200-400 kms-1, smaller than the flow speed (>~400 kms-1) in the adjacent magnetosheath, and flow and field perturbations satisfy the criteria for a rotational discontinuity. The velocity component parallel to the mantle magnetic field line is positively correlated with the ion number density, consistent with a boundary layer interpretation. The component of the velocity perpendicular to the magnetic field lines is predominantly poleward at speeds up to 150 kms-1. This poleward convection can be interpreted as being driven by a J×B force operating on the field lines.

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