Physics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98..131b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A1, p. 131-141.
Physics
3
Boundary Layer Plasmas, Geomagnetic Tail, Ion Beams, Nonuniform Plasmas, Wave Propagation, Whistlers, Current Sheets, Electromagnetic Wave Transmission, Plasma Density
Scientific paper
The generation and propagation of low-frequency whistler waves excited by ion beams in the plasma sheet boundary layer are followed using standard ray tracing techniques and assuming a Harris-type neutral sheet magnetic field profiles. The density is chosen such that the total pressure remains constant. The wave energy is calculated along the wave path taking into account growth due to the ion beam while the wave is in the plasma sheet boundary layer as well as damping due to resonant interactions with the background plasma. The results show that the electromagnetic waves are guided toward the central plasma sheet by the plasma gradients but are damped out before reaching the neutral plane itself due to Cerenkov resonance with the hot central plasma sheet background ions. The amplitudes and final positions of the waves depend on the temperature of the background plasma, the ion beam drift speed, and the ion beam thermal speed.
Ashour-Abdalla Maha
Burinskaia T.
Schriver David
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