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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 16, issue 8
Ann. Geophys., 16, 900-913, 1998
https://doi.org/10.1007/s00585-998-0900-5
© European Geosciences Union 1998
Ann. Geophys., 16, 900-913, 1998
https://doi.org/10.1007/s00585-998-0900-5
© European Geosciences Union 1998

  31 Aug 1998

31 Aug 1998

Standing Alfvén waves with m ≫ 1 in an axisymmetric magnetosphere excited by a stochastic source

A. S. Leonovich and V. A. Mazur A. S. Leonovich and V. A. Mazur
  • Institute of Solar-Terrestrial Physics, Russian Academy of Science, Siberian Branch, Irkutsk 33, PO Box 4026, 664033 Russia

Abstract. In the framework of an axisymmetric magnetospheric model, we have constructed a theory for broad-band standing Alfvén waves with large azimuthal wave number m » 1 excited by a stochastic source. External currents in the ionosphere are taken as the oscillation source. The source with statistical properties of "white noise" is considered at length. It is shown that such a source drives oscillations which also have the "white noise" properties. The spectrum of such oscillations for each harmonic of standing Alfvén waves has two maxima: near the poloidal and toroidal eigenfrequencies of the magnetic shell of the observation. In the case of a small attenuation in the ionosphere the maximum near the toroidal frequency is dominated, and the oscillations are nearly toroidally polarized. With a large attenuation, a maximum is dominant near the poloidal frequency, and the oscillations are nearly poloidally polarized.<

Key words. Ionosphere-magnetosphere interaction · Wave propagation · Magnetospheric physics · MHD waves and instabilities

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