Computer Science
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993rasc...28..629o&link_type=abstract
Radio Science (ISSN 0048-6604), vol. 28, no. 4, p. 629-642.
Computer Science
1
Earth Ionosphere, Hiss, Isis Satellites, Narrowband, Plasmapause, Electric Fields, Geomagnetic Latitude, Very Low Frequencies
Scientific paper
Typical frequency-time spectra of narrow-band hiss obtained near plasmapause latitude from ISIS VLF electric field data (50 Hz to 30 kHz) telemetered at Syowa Station, Antarctica, under quiet conditions, are similar to those of narrow-band 5-kHz hiss observed at midlatitudes and low latitudes on the ground. This hiss in the topside ionosphere first appeared as a thin, bar-shaped emission around 5 kHz at geomagnetic invariant latitude of about 56 deg and grew into a wider band between 3 and 6 kHz at invariant latitudes around 60 deg which is the average plasmapause latitude. Then, at higher latitudes, the band narrowed somewhat and disappeared around 65 deg. The hiss had no lower-frequency cutoff, and its center frequency remained approximately constant at 5 kHz, between about 56 and 65 deg. This narrow-band hiss is completely different from the electrostatic LHR hiss which is also observed above the ionosphere with an electric antenna, but which has latitude-dependent lower-frequency cutoff. Latitude and local time distributions of the occurrence rate for narrow-band plasmapause hiss were obtained by analyzing six-frequency narrow-band data processed from the wideband VLF signals received at Syowa Station from ISIS 1 and ISIS 2 during 507 passes between December 1976 and January 1983.
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