Parametric decay of whistlers - A possible source of precursors

Details Parametric decay of whistlers - A possible source of precursors Parametric decay of whistlers - A possible source of precursors

Jul 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976georl...3..405r&link_type=abstract

Geophysical Research Letters, vol. 3, July 1976, p. 405-407.

Physics

4

Atmospheric Attenuation, Earth Magnetosphere, Plasma-Electromagnetic Interaction, Wave Interaction, Whistlers, Ion Acoustic Waves, Propagation Modes, Thresholds, Wave Amplification

Scientific paper

Laboratory plasma experiments show that, above a certain threshold field strength, a whistler-mode wave (WMW) may decay parametrically into a backward propagating WMW and a low-frequency ion-acoustic wave. The required threshold field for a 2 kHz wave in the equatorial plane of the magnetosphere, just inside the plasmapause, is found to be well below 1 mV/m. It is suggested that the resulting backward travelling WMW may be responsible for triggering precursors - rising frequency emissions which are occasionally observed to precede two (or more) hop whistlers.

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