Whistler induced suppression of VLF noise

Details Whistler induced suppression of VLF noise Whistler induced suppression of VLF noise

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.1015g&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Feb. 1, 1984, p. 1015-1022.

Physics

7

Atmospherics, Earth Magnetosphere, Noise Reduction, Very Low Frequencies, Whistlers, Bandpass Filters, Ground Truth, Radio Echoes

Scientific paper

A class of suppression effects is investigated involving the reduction in amplitude of a natural VLF noise band following the reception of a whistler. Data acquired at South Pole Station during 1981 showed such suppression events on 20 percent of all winter days. A review of data from Siple, Byrd, Eights, and Palmer Stations in Antarctica and Roberval in Quebec, Canada, has identified many more events. The attenuation typically reaches a maximum of 3-5 dB in 5-10 s, and the noise band recovers to the pre-event amplitude 15-30 s after the whistler. The noise bands are generally mid-latitude hiss, but suppression associated with polar chorus has been seen. Regularly observed features of suppression events include multi-hop echoing of the driving whistler; confinement of the whistler echoes to the frequency band occupied by the suppressed noise; suppression during the first pass of the whistler; continuing suppression by the whistler echoes as the suppressed noise amplitude reaches a minimum and then recovers; and recovery of the noise band to the pre-event level. At the present level of understanding, it is concluded that whistler suppression and the Quiet Band effect are closely related.

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