A narrow region of electron beams at the poleward edge of the cusp

Details A narrow region of electron beams at the poleward edge of the cusp A narrow region of electron beams at the poleward edge of the cusp

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.7585y&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A5, p. 7585-7591.

Mathematics

Logic

11

Earth Magnetosphere, Electron Beams, Interplanetary Magnetic Fields, Magnetic Poles, Polar Cusps, Energy Dissipation, Energy Spectra, Spectrograms, Viking Orbiter Spacecraft

Scientific paper

Viking instrument data have been used to find a small region of faint field-aligned electron beams at the poleward boundary of the cusp-cleft region when the IMF is northward or very weak. The characteristic energy for the electron beam is 100-300 eV. Downward-oriented beams are more frequently observed than upward-oriented beams, but this can be understood if the thickness of this layer corresponds to one spin period of the satellite or less. This narrow region is morphologically different from both the polar arc and the merging-related electron injection region. The absence of the cusp poleward edge near local noon indicates that it can be mapped to the boundary layer somewhere in the distant magnetotail. This local time dependence is further evidence that the cusp poleward edge is different from both the polar arc and the merging-related electron injection region. Although the cusp poleward edge is characterized by electron beams, there is no large-scale field-aligned current according to the magnetic field data. This indicates that the electron beams are bidirectional rather than downward-oriented.

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