Theory and computer simulations of magnetospheric very low frequency emissions

Details Theory and computer simulations of magnetospheric very low frequency emissions Theory and computer simulations of magnetospheric very low frequency emissions

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.1473v&link_type=abstract

Journal of Geophysical Research, vol. 87, Mar. 1, 1982, p. 1473-1489.

Physics

37

Atmospherics, Computerized Simulation, Earth Magnetosphere, Radio Emission, Very Low Frequencies, Monochromatic Radiation, Particle Trajectories, Time Dependence, Wave Amplification, Wave Packets, Whistlers

Scientific paper

An analytical and computer-simulation examination is presented of a nonlinear mechanism which accounts for the two features that are essential to any theory of magnetospheric VLF emission, at both fixed and varying frequencies: (1) the triggering of monochromatic emissions by signals of sufficient strength and duration while background noise and weak, short signals are not amplified; and (2) the occurrence of frequency changes after the emissions have reached a sufficiently large amplitude. The mechanism depends on a simultaneous propagation and amplification of wave packets along geomagnetic lines, to maintain a uniformity ratio in the regime corresponding to maximum amplification. For a constant frequency, this condition yields triggering thresholds related to properties of the magnetosphere, while the condition for the large-amplitude portion of the risers is yielded for the case of varying frequency.

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