Other
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82..515c&link_type=abstract
Journal of Geophysical Research, vol. 82, Feb. 1, 1977, p. 515-522.
Other
3
Magnetohydrodynamic Flow, Magnetopause, Plasma Layers, Satellite Observation, Anisotropy, Boundary Layer Plasmas, Earth Magnetosphere, Explorer 33 Satellite, Magnetic Field Configurations, Magnetosheath, Plasma Diagnostics, Time Dependence
Scientific paper
Low fluxes of stagnant or irregularly flowing plasma along the inside of the magnetopause labeled as the entry layer by Haerendel and Paschmann, are observed on Explorer 33 orbits which cross the dayside magnetopause and on one orbit which skims the dawn flank. The data indicate that the entry layer is a permanent magnetospheric feature which extends across the dayside and along the flanks to large distances down the tail on dipolelike field lines between extensions of the northern and southern polar cusps. Pressure anisotropies are present in the entry layer but are often weaker and less frequent than those in the adjacent magnetosheath. These anisotropies give clues about the process of entry layer formation. The sense of anisotropy when it is present on both sides of the magnetopause is the same for magnetosheath fields with a southward component and opposite for fields with a northward component. These correlations are consistent with entry layer filling by bulk flow along field lines opened by magnetic merging in the one case and by diffusion onto closed field lines in the other.
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