Physics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...52..329f&link_type=abstract
(URSI, Conference on Wave-Induced Particle Precipitation and Wave-Particle Interactions, Dunedin, New Zealand, Feb. 5-11, 1989)
Physics
8
Electron Precipitation, Ionospheric Propagation, Very Low Frequencies, Whistlers, Antarctic Regions, Electron Scattering, Gyrofrequency, Radiation Belts
Scientific paper
'Trimpi' amplitude perturbations on VLF signals received at Sanae, Antarctica, have been identified using a new computerized technique. A survey of 1982 data, taken during magnetically disturbed times, shows that events of short duration (less than 25 s) constitute 60 percent of all events detected and that all events found are amplitude attenuations with deviations from quiescent levels ranging up to 90 percent. It is unusual, at Sanae, to observe the causative whistler with a Trimpi event. This, together with further evidence from Trimpi occurrence statistics, may suggest that the gyroresonant interactions responsible for some of the events occur with nonducted whistler mode waves. A method for estimating the extent of the precipitation region is presented.
Friedel Reiner H. W.
Hughes Arthur R. W.
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