Characteristics of the magnetospheric boundary layer and magnetopause layer as observed by Imp 6

Details Characteristics of the magnetospheric boundary layer and magnetopause layer as observed by Imp 6 Characteristics of the magnetospheric boundary layer and magnetopause layer as observed by Imp 6

May 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.2019e&link_type=abstract

Journal of Geophysical Research, vol. 84, May 1, 1979, p. 2019-2028. Research sponsored by the U.S. Department of Energy.

Physics

28

Boundary Layers, Magnetopause, Magnetospheric Instability, Plasma Diagnostics, Electron Density Profiles, Electron Energy, Energy Spectra, Explorer 43 Satellite, Magnetohydrodynamic Flow, Magnetosheath

Scientific paper

Imp 6 observations of the low-latitude magnetospheric boundary layer indicate that the plasma within it is supplied primarily by direct entry of magnetosheath plasma across the magnetopause layer. The magnetopause layer is defined as the current layer (separating the magnetosheath from the boundary layer) through which the magnetic field shifts in direction. High temporal resolution (3-s average) data reveal that in a majority of Imp 6 magnetopause crossings, no distinct changes in electron density or energy spectra are observed at the magnetopause layer. In all Imp 6 crossings, some magnetosheathlike plasma is observed earthward of the magnetopause layer, implying the existence of a boundary layer. Boundary layer electron energy spectra are often virtually indistinguishable from the adjacent magnetosheath spectra. Low-latitude boundary layer bulk plasma flow as observed by Imp 6 almost always has an antisunward component and often has a significant cross-field component. The boundary layer thickness is highly variable and is generally much larger than the magnetopause layer thickness.

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