Physics
Scientific paper
Apr 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.4365b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, April 1, 1986, p. 4365-4379.
Physics
19
Acetonitrile, Earth Magnetosphere, Geomagnetism, Gyromagnetism, High Energy Electrons, Magnetically Trapped Particles, Amplitudes, Resonance, Thresholds, Very Low Frequencies, Whistlers
Scientific paper
A recently developed theory is used to calculate the wave magnetic field amplitude threshold, B-tau, necessary to allow the nonlinear trapping of energetic gyroresonant and Landau resonant electrons by VLF whistler mode waves in the magnetosphere propagating at an arbitrary angle, psi, with respect to the earth's magnetic field. A detailed raytracing study is carried out to establish the variation of psi with position along each magnetic shell in the range L = 2-5 and for frequencies 5-17.8 kHz. It is found that the minimum values of B-tau along each L shell generally occur at points of second-order resonance. In general, for nonducted fixed frequency signals there is only one point of second-order resonance on each L shell, and this is located within a few degrees of the magnetic equator. However, over a narrow range of L, there are as many as three points of second-order resonance and as many as three associated minima in B-tau. At least one of these points is located more than 10 deg from the magnetic equator.
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