Other
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980georl...7..851f&link_type=abstract
Geophysical Research Letters, vol. 7, Oct. 1980, p. 851-853.
Other
Atmospherics, Geomagnetic Pulsations, Very Low Frequencies, Earth Magnetosphere, Spectrograms, Whistlers
Scientific paper
Several different mechanisms have been suggested for the natural stimulation of Pc 1 geomagnetic pulsation events, including hydromagnetic noise in the magnetosphere, bursts of radiation from high-energy charged particles, or sferics from lightning discharges. Guided by the results of experiments to generate Pc 1 pulsations by VLF transmissions into the magnetosphere, and by the theory that has been developed in support of these experiments, is proposed: the stimulation of Pc 1 pulsation events by naturally occurring repetitive VLF signals. The VLF signals may be echoing whistlers, periodic chorus elements, or other periodic or quasi-periodic VLF wavetrains echoing along a geomagnetic field line. Preliminary support for this hypothesis is provided by a comparison of the Pc 1 pulsations and VLF activity occurring at Roberval, Quebec, during nine intervals of simultaneous Pc 1 pulsation and VLF measurement.
Fraser-Smith Antony C.
Helliwell Robert A.
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