The thickness of the magnetopause current layer - ISEE 1 and 2 observations

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Current Sheets, Magnetopause, Satellite Sounding, Space Plasmas, Thickness, International Sun Earth Explorers, Magnetometers, Magnetosheath, Temporal Distribution

Scientific paper

ISEE 1 and 2 magnetometer data over the dayside magnetosphere are analyzed to present a global survey of the magnetopause thickness. It is shown that earlier magnetopause velocities have been somewhat underestimated, with results indicating constant rapid and irregular motion and velocities ranging from 10-80 km/s in 80% of the cases. The magnetopause thickness is found to be between 400-1000 km, with larger thicknesses also observed, and the thickness does not seem to depend on the orientation of the magnetosheath magnetic field, but does appear to be ordered by dipole magnetic latitude so that the magnetopause current sheet is thinnest near the magnetic equator, which suggests that reconnection is initiated in the equatorial regions rather than in the polar cusps.

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