Physics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1829p&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, Oct. 1990, p. 1829-1832.
Physics
51
Atmospheric Boundary Layer, Electric Fields, Magnetic Field Reconnection, Magnetopause, Plasma Dynamics, Ampte (Satellites), Ionospheric Electron Density, Satellite Observation
Scientific paper
Convection electric fields, EC = -Vp x B, measured during a magnetopause/boundary-layer encounter at low latitude by the AMPTE/IRM spacecraft, are shown to yield an accurate determination of the magnetopause normal vector, N, even though the magnetic shear across the magnetopause was small. The average plasma velocity along N is used to deduce a boundary-layer thickness of about 1.3 earth radii. Analysis of EC in the magnetopause itself reveals the existence of a deHoffmann-Teller frame in which the flow is nearly field-aligned and approximately Alfvenic, indicating that the magnetopause was a rotational discontinuity; this is interpreted as a signature that magnetic-field reconnection was occurring somewhere on the magnetopause.
Baumjohann Wolfgang
Papamastorakis Ioannis
Paschmann Goetz
Sckopke Norbert
Sonnerup B.
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