The morningside low-latitude boundary layer as determined from electric and magnetic field measurements on Geotail

Details The morningside low-latitude boundary layer as determined from electric and magnetic field measurements on Geotail The morningside low-latitude boundary layer as determined from electric and magnetic field measurements on Geotail

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2983m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 25, p. 2983-2986

Physics

9

Electric Fields, Flow Velocity, Magnetic Fields, Magnetohydrodynamic Flow, Magnetopause, Magnetosheath, Satellite Observation, Space Plasmas, Electric Field Strength, Geophysical Satellites, Magnetic Flux, Plasma Potentials, Satellite Orbits, Velocity Distribution

Scientific paper

On October 17, 1992, the Geotail satellite crossed the dawnside magnetopause approximately 41 times. At the majority of these crossings, the magnetic field and the normal component of the electric field were larger and the plasma density was smaller in a low-latitude boundary layer than they were in either the nearby magnetosheath or in the magnetosphere. These results are intepreted in terms of the Kelvin-Helmholtz instability associated with velocity shear at the magnetopause. Consistent with this interpretation, it is shown that the low-latitude boundary layer was the region where the flow decreased from its magnetosheath to magnetospheric value. Evidence is presented that the magnetopause was locally oriented within less than 20 deg of its nominal geometry on these crossings and that it moved with an amplitude of 1500-6000 kilometers. The thickness of the low-latitude boundary layer averaged 800 kilometers and the electric potential across it averaged 4 kilovolts with a spread of a factor of 2. Thus, the viscous interaction and similar processes are not significant contributors to magnetospheric convection.

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