Transformation and absorption of magnetosonic waves generated by solar wind in the magnetosphere |
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| Authors: | DA Kozlov |
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| Institution: | a Institute of Solar-Terrestrial Physics, Siberian Department of Russian Academy of Sciences, P.O. Box 291, Irkutsk 664033, Russia |
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| Abstract: | Resonant transformation of fast magnetosonic (FMS) wave flux into Alfven and slow magnetosonic (SMS) oscillations is investigated in the one-dimensionally inhomogeneous magnetosphere. Spatial distribution of energy absorption rate of FMS oscillations penetrating into the magnetosphere from the solar wind is studied. The FMS wave energy absorption rate caused by magnetosonic resonance excitation is shown to be several orders of magnitude greater than that caused by Alfven resonance excitation at the same surface. It is connected with the spectrum of incident FMS waves. The Kolmogorov spectrum is used in numerical calculations. Magnitude of the Fourier harmonics exciting resonant Alfven oscillations is much smaller than that of the harmonics driving lower-frequency magnetosonic resonance. It is shown that resonant transformation of FMS waves into SMS oscillations can be an effective mechanism of energy transfer from the solar wind to the magnetosphere. |
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| Keywords: | Magnetosphere MHD oscillations Solar wind-magnetosphere interaction |
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