Excitation of magnetosonic waves with discrete spectrum in the equatorial vicinity of the plasmapause |
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Authors: | AV Gulelmi BI Klaine AS Potapov |
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Institution: | Borok Observatory, IPhE, Academy of Science, U.S.S.R.;Sib IZMIR, Siberian Department of the Academy of Science, U.S.S.R. |
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Abstract: | There is a magnetosonic waveguide under the arch of the plasmasphere. This channel, in the form of a ring with radius L~4, surrounds the Earth. It is shown that in this region of the magnetosphere the flute-like electromagnetic disturbances (k6 = 0) with frequencies ω = sωp can be excited by energetic protons, with non-monotonic dependence on transverse energy (). The interpretation of magnetic pulsations which have been observed in the equatorial vicinity of the plasmapause on the satellite OGO-3 in the frequency range ~102 cps (Russell et al., 1970) is given. In particular the origin of discrete structure of the observed spectra (narrow band spikes for a rather broad range of frequency) is discussed. |
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