Physics
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.5165f&link_type=abstract
Journal of Geophysical Research, vol. 82, Nov. 1, 1977, p. 5165-5170.
Physics
2
Electron Flux Density, Lines Of Force, Magnetically Trapped Particles, Polar Caps, Atmospheric Models, Electron Beams, Electron Energy, Energy Spectra, Geomagnetic Tail, Particle Acceleration, Pitch (Inclination), Plasma Sheaths
Scientific paper
A model is proposed to describe a fluctuating magnetotail barrier potential associated with electron fluxes over the polar cap. Low-energy electron fluxes over the polar caps may at times be accelerated and trapped by a large-scale potential barrier in the magnetotail; if the effective potential difference at the barrier fluctuates randomly about an average value, a fraction of the beam flux accelerated toward the earth from beyond the barrier can be trapped between the barrier and the earth, and additional low-energy electrons diffusing onto field lines closed to particle losses by the potential barrier would also be quasi-trapped. When the observed tail lobe spectrum is taken to be the electron source distribution beyond the barrier, the model adequately simulates the electron intensity, energy spectrum, and pitch angle distribution observed at low altitudes over the polar cap
Burrows J. R.
Foster Christopher J.
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