On the generation mechanism of hiss-triggered chorus

Details On the generation mechanism of hiss-triggered chorus On the generation mechanism of hiss-triggered chorus

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9..603n&link_type=abstract

Annales Geophysicae (ISSN 0939-4176), vol. 9, Sept. 1991, p. 603-613. Research supported by NERC.

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14

Acoustic Frequencies, Dawn Chorus, Magnetospheric Electron Density, Random Noise, Whistlers, Frequency Ranges, Very Low Frequencies

Scientific paper

A theory is presented of the generation mechanism of hiss triggered chorus. Band limited VLF hiss emission in the off equatorial region of the magnetosphere can deform the electron distribution to give enhanced linear whistler instability near the upper cutoff frequency. Non-self-consistent computations of the nonlinear resonant particle currents produced by a large amplitude hiss band confirm a sharp peak in growth rate near the top of the band. At low amplitudes this peak would appear to be mainly due to the deformation of the phase averaged distribution function by multipass interaction with the hiss band. At higher root-mean-square amplitudes, of order of 50pT, nonlinear wave-particle interaction effects seem to predominate. Enhanced growth rates at the top of the band will produce coherent narrow band wavelets which can trigger chorus elements through nonlinear wave-particle interaction effects.

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