Statistics – Computation
Scientific paper
Apr 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....94.3773d&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 94, April 1, 1989, p. 3773-3778.
Statistics
Computation
16
Earth Magnetosphere, Neutral Sheets, Particle Motion, Polar Regions, Protons, Magnetic Field Configurations, Particle Acceleration, Particle Trajectories, Wind Effects
Scientific paper
The transport of polar wind protons from their ionospheric source through the magnetosphere is examined, using three-dimensional particle codes. The trajectory simulations demonstrate the escape of the high-latitude polar wind in the boundary layers during the quiescent magnetosphere, and, in contrast, its trapping in the nightside plasma sheet at times of high Kp. It is shown that the equatorial curvature of the magnetic field lines plays the role of an acceleration filter which yields, during active conditions, an 'ion band'-like precipitation of the polar wind protons characterized by a decrease of the downflowing ion energy with latitude, from several hundred down to a few electron volts. A further comparison between data and computations tends to indicate that, during disturbed times, the dayside originating polar wind provides an important contribution to the hundreds of electron volt downflowing protons in the nightside sector.
Chappell Charles R.
Delcourt Dominique C.
Moore Thomas Earle
Waite H. Jr. J..
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