Photometric evidence of electron precipitation induced by first HOP whistlers

Details Photometric evidence of electron precipitation induced by first HOP whistlers Photometric evidence of electron precipitation induced by first HOP whistlers

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983georl..10..611d&link_type=abstract

(Chapman Conference on Waves in Magnetospheric Plasmas, Kona, HI, Feb. 1983) Geophysical Research Letters (ISSN 0094-8276), vol.

Physics

19

Electron Precipitation, Ionospheric Electron Density, Light Emission, Photometry, Whistlers, Cyclotron Resonance, Magnetic Storms, Propagation Modes, Very Low Frequencies, Wave Propagation

Scientific paper

Attention is given to the first ionospheric optical emission observations correlated with VLF waves at Roberval, Quebec (which is the conjugate location of Siple Station, Antarctica), affording a clear perspective on the direct precipitation induced during the first pass of the wave during its southward propagation. The optical emissions were found to lead the arrival time of the two-hoop waves by about 0.7 sec, instead of lagging behind the local waves by about 1-2 sec as had been previously observed for whistler-driven events at Siple. The observed arrival time relationships are consistent with the predictions of a cyclotron resonance interaction model, thereby supporting previous Roberval observations of X-rays. Although structured optical emissions correlated with wave bursts can be detected at Roberval, rather large magnetospheric particle fluxes may be required to produce such events.

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