Physics
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16.1125w&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 16, Oct. 1989, p. 1125-1128.
Physics
1
Boundary Layer Plasmas, Earth Magnetosphere, Energetic Particles, Particle Acceleration, Electrostatic Waves, Fermi Surfaces, Magnetohydrodynamic Stability
Scientific paper
A longstanding question in the field of magnetospheric physics is the source of the energetic particles which are commonly observed along the plasma-sheet boundary layer (PSBL). Several models have been suggested for the acceleration of these particles. Here, a means is suggested by which the fast Fermi acceleration mechanism (Wu, 1984) can accelerate electrons at the plasma sheet and perhaps account for some of the observations. In this scheme, a localized hydromagnetic disturbance propagating through the tail lobe region impinges upon the PSBL, deforming it and displacing it in toward the central plasma sheet. The boundary layer can then act like a moving magnetic mirror. If the disturbance is propagating nearly perpendicular to the layer, then its velocity projected parallel to the layer (and the magnetic field) can be very large, resulting in significant acceleration of reflected particles.
Krauss-Varban Dietmar
Lui Anthony Tat Yin
Mandt M. E.
Wu Shang-Chen
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