Physics
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jatp...54..197k&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 54, Feb. 1992, p. 197-203.
Physics
1
Atmospheric Physics, Earth Magnetosphere, Field Aligned Currents, Radio Emission, Very Low Frequencies, Wave Propagation, Atmospheric Attenuation, Current Density, Electron Beams, Plasmapause, Vlasov Equations, Whistlers
Scientific paper
The growth rate of whistler-mode waves is calculated analytically for a bi-Maxwellian plasma in the presence of a beam of cool electrons. This beam is moving in the same direction as the gyroresonant electrons, and in the opposite direction to the waves, which are considered to propagate parallel (or anti-parallel) to the imposed geomagnetic field. A somewhat surprising result is found. This is that even if the anisotropy is greater than a critical value, which is strongly frequency dependent, the beam reduces the growth of the waves near half the electron gyrofrequency. For a field-aligned current density about 1 microA/sq m, this mechanism can explain the lack of signals near 1.4 kHz on auroral (return current) flux tubes. It can also explain the observed absorption of signals at half the electron gyrofrequency, around 7 kHz on L = 4 flux tubes, near the equatorial plane, and just outside the plasmapause.
Kulkarni V. H.
Rycroft Michael J.
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