Computer Science – Sound
Scientific paper
Dec 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jatp...45..823m&link_type=abstract
Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 45, Dec. 1983, p. 823-832.
Computer Science
Sound
Extremely Low Frequencies, Ionospheric Sounding, Upper Ionosphere, Whistlers, Energy Spectra, Intercosmos Satellites, Night Sky, Plasma Spectra, Power Spectra, Summer
Scientific paper
Results of a detailed study by digital methods of the energy spectra and the frequency-time characteristics of electromagnetic radiation stimulated by short fractional hop whistlers (S.W.) observed on Intercosmos 14 are presented. The phenomenon was observed at frequencies below 1 kHz in the ionosphere at altitudes from 360 to 450 km during summer night. It has been shown that the intensity of the stimulated emission is greater by an order of magnitude or more than that of the natural noise background and of the same order of magnitude or a little lower than the intensity of the triggering S.W. The duration of the stimulated emission varies from 0.27 to 0.64 s. The energy spectra of this emission have two maxima at frequencies of 730 + or - 35 Hz and 940 + or 35 Hz, with a bandwidth of 150 to 300 Hz.
Kapustina O. V.
Mikhailov Iu. M.
Mikhailova G. A.
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