A theory of triggered emissions

Details A theory of triggered emissions A theory of triggered emissions

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83.1433r&link_type=abstract

Journal of Geophysical Research, vol. 83, Apr. 1, 1978, p. 1433-1441.

Physics

10

Electron Distribution, Radio Emission, Trapped Particles, Wave Propagation, Whistlers, Distribution Functions, Electron Bunching, Ergodic Process, Lines Of Force, Monochromatic Radiation, Plasma-Particle Interactions, Self Sustained Emission, Very Low Frequencies, Wave Amplification

Scientific paper

The motion of electrons trapped in the potential troughs of a monochromatic whistler wave propagating along geomagnetic field lines is studied. Because of the coupling between inhomogeneity and trapping effects the distribution function of electrons at the termination of this triggering pulse can be very different from the distribution at its front provided that the triggering wave amplitude and duration are large enough to trap electrons over more than one trapping length. Particles which are detrapped at the triggering wave termination have been phase organized and may then act coherently for a while, giving rise to an emission with either rising or falling tones, depending on the sign of the inhomogeneity variation. The spatially averaged part of the distribution function of these suddenly detrapped electrons is shown to generate an instability which amplifies previously emitted waves. These results are compared with existing data. Finally, it is shown that emitted waves can easily trap electrons, thus explaining how the process of emission can be self-sustained.

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