The thickness and structure of high beta magnetopause current layer

Details The thickness and structure of high beta magnetopause current layer The thickness and structure of high beta magnetopause current layer

Nov 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21.2451l&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 23, p. 2451-2454

Physics

21

Atmospheric Boundary Layer, Magnetic Fields, Magnetohydrodynamic Flow, Magnetopause, Magnetosheath, Plasma Waves, Wave Propagation, Field Strength, Flow Velocity, International Sun Earth Explorers, Ion Distribution, Magnetic Measurement, Thickness

Scientific paper

Previous surveys of the magnetopause current layer indicated that its thickness ranges from 200 to 1800 km and on average is about 900 km or approximately 10 ion gyroradii. In the present study, we have used International Sun Earth Explorer (ISEE) magnetic field data to examine the magnetopause current layer under high beta magnetosheath conditions. Under high beta conditions, we find that the current layer is thinner than observed under typical conditions. The thickness is typically between 200 to 600 km and the peak of the distributed scales to 2-4 ion gyroradii for the high beta magnetopause. However, the velocity of the magnetopause is found to be highly variable similar to the highly variable distribution observed under more typical conditions. A wave-like structure is often observed at the foot of the current layer extending from the current layer into the magnetosheath. The presence of this propagating wave structure at the foot of the magnetopause may lead to some confusion in attempts to determine the thickness of the current layer with a single spacecraft.

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