ELF emission in the outer ionosphere stimulated by short fractional hop whistlers |
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| Affiliation: | 1. Faculty of Electronics, Telecommunications, and Informatics, Gdansk University of Technology, Narutowicza 11/12, Gdansk 80-233, Poland;2. Faculty of Mathematics, Physics and Informatics, University of Gdansk, Gdansk 80-308, Poland;1. Laboratoire de Génie Electrique et Ferroélectricité – INSA de Lyon, Villeurbanne, France;2. ELyTMaX UMI 3757, CNRS – Université de Lyon – Tohoku University, International Joint Unit, Tohoku University, Sendai, Japan;3. School of Mechanical, Electrical and Information Engineering, Shandong University, Weihai, China;1. Faculty of Mathematics, Physics and Informatics, University of Gdansk, Gdansk 80-308, Poland;2. Faculty of Electronics, Telecommunications, and Informatics, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland |
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| Abstract: | 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 I 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+ 35 Hz and 940+ 35 Hz, with a bandwidth ΔF ≃ 150 to 300 Hz. |
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