Physics
Scientific paper
May 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jatp...52..385o&link_type=abstract
(URSI, Conference on Wave-Induced Particle Precipitation and Wave-Particle Interactions, Dunedin, New Zealand, Feb. 5-11, 1989)
Physics
4
Earth Magnetosphere, Electron Precipitation, Ionospheric Propagation, Polar Regions, Very Low Frequencies, Broadband, Cerenkov Radiation, Geomagnetism, Isis Satellites, Whistlers
Scientific paper
A polar map of the occurrence rate of the broadband auroral VLF hiss is developed for different geomagnetic activities from 347 ISIS-VLF passes received at Syowa station, Antarctica from June 1976 to January 1983. Broadband auroral VLF hiss was characterized by simultaneous intensity increases above 5 dB, compared with the quiet level of 5, 8, 16, and 20 kHz bands at invariant latitudes above 60 degrees, utilizing narrow-band intensity data processed from magnetic tapes of ISIS electric field (50 Hz-30 kHz data). Polar cusp hiss with an irregular spectrum in time, intensity, and frequency occurs predominantly in the 09-11 h MLT interval, and is evidently different from the broadband auroral VLF hiss. It is also statistically evident that broadband auroral hiss is closely related to the inverted-V electrons precipitated from the boundary plasma sheet.
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