Rapid whistler-mode wave growth resulting from frequency-time curvature

Details Rapid whistler-mode wave growth resulting from frequency-time curvature Rapid whistler-mode wave growth resulting from frequency-time curvature

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..599h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, April 1990, p. 599-602.

Physics

5

Cyclotron Resonance, Very Low Frequencies, Wave Propagation, Whistlers, Earth Magnetosphere, Frequency Distribution, Radio Signals, Temporal Distribution

Scientific paper

An experiment is described, in which the rapid temporal growth of a one-hop nose whistler was simulated using controlled injection of VLF pulses from the Siple-Station (Antarctica) transmitter. The results show that, when the frequency-time function of the injected pulse has a positive slope and a negative curvature, producing a kind of 'chirp' such that it approximates the f(t) shape of a lightning-generated whistler at frequencies above the nose frequency, growth up to a saturation level commonly occurs within less than 50 ms, as opposed to 200-300 ms required for monochromatic input signals. An important aspect of this resonance model is that growth is not limited to the region near the equator, but may occur anywhere along the field line as long as the necessary resonant electron distribution exists.

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