Seasonal, latitudinal and diurnal distributions of whistler-induced electron precipitation events

Details Seasonal, latitudinal and diurnal distributions of whistler-induced electron precipitation events Seasonal, latitudinal and diurnal distributions of whistler-induced electron precipitation events

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.3429c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, April 1, 1987, p. 3429-3435.

Physics

24

Annual Variations, Diurnal Variations, Electron Precipitation, Extremely Low Radio Frequencies, Magnetic Storms, Whistlers, Earth Ionosphere, Electron Energy

Scientific paper

The seasonal, latitudinal, and diurnal distributions of whistler-induced electron precipitation events, detected as subionospheric signal perturbations (Trimpi events), have been studied by means of data sets acquired in 1982-1983 at Palmer and Siple stations, Antarctica. The data sets, substantially larger than any previously examined, confirm previous indications of a broad (about 4 h) maximum in hourly event occurrence rates. The peak was centered about 1-2 h after local midnight at Palmer for the roughly north-south Argentina Omega 12.9-kHz path, but was shifted several hours later for the 23.4-kHz NPM path, which has a westerly arrival bearing at Palmer. The previously reported seasonal variation, with peaks at the equinoxes, was confirmed; activity persisted in the austral winter, particularly following a magnetic storm, but in general occurred on fewer days and during shorter daily periods. Comparisons of five months of simultaneous Palmer and Siple receptions of 21.4-kHz NSS signals on north-south paths suggest that most of the events observed at Siple occurred as the result of ionospheric perturbations relatively close to the L shell of Palmer, that is, in the range L = 2-3.

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