Plasma and magnetic field characteristics of the distant polar cusp near local noon - The entry layer

Details Plasma and magnetic field characteristics of the distant polar cusp near local noon - The entry layer Plasma and magnetic field characteristics of the distant polar cusp near local noon - The entry layer

Jun 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81.2883p&link_type=abstract

Journal of Geophysical Research, vol. 81, June 1, 1976, p. 2883-2899. Research supported by the Science Research Council of Eng

Physics

47

Geomagnetism, Magnetohydrodynamic Flow, Magnetopause, Plasma Layers, Polar Cusps, Polar Regions, Field Aligned Currents, Heos B Satellite, Hot Electrons, Lines Of Force, Magnetosheath, Plasma Density, Plasma Temperature, Ring Currents, Trapped Particles

Scientific paper

Heos 2 plasma and magnetic field measurements in the distant polar cusp region reveal the existence of a plasma layer on day side field lines just inside the magnetopause. Density and temperature in this layer are nearly the same as they are in the adjacent magnetosheath. Flow directions toward and away from the sun as well as parallel to the field lines have been found. The magnetopause mostly coincides with the transition to ordered magnetosheath flow. The inner boundary of the layer is located just within the outer boundary of the hot ring current plasma. In the region of overlap the hot electrons have the signature of trapped particles. The magnetic field is strongly fluctuating in magnitude. Its orientation is systematically distorted out of the meridian plane. The layer is thought to be a consequence of the entry of magnetosheath plasma, which does not appear to be unobstructed. The magnetopause has a cusplike orientation which is elongated in local time. The existence of field-aligned currents are inferred from the systematic bending of field lines. It is proposed that the dynamo of the related current system is provided by the transfer of perpendicular momentum resulting from the plasma entry into the layer.

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