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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 12, issue 10/11
Ann. Geophys., 12, 1022–1026, 1994
https://doi.org/10.1007/s00585-994-1022-3
© European Geosciences Union 1994
Ann. Geophys., 12, 1022–1026, 1994
https://doi.org/10.1007/s00585-994-1022-3
© European Geosciences Union 1994

  31 Aug 1994

31 Aug 1994

The transformation of magnetoacoustic waves into Alfvén waves inside the magnetosphere

A. E. Kozlovsky, V. V. Safargaleev, and W. B. Lyatsky A. E. Kozlovsky et al.

Abstract. A mechanism for the transformation of a magnetoacoustic wave into an Alfvén wave is proposed. During the compression of the magnetosphere by the solar wind the inner edge of the plasma sheet and the contours of B=const move in different ways. In the case of asymmetrical compression, the contours of B=const will cross the inner edge of the plasma sheet. To close the drift currents - that flow in the plasma sheet along the contours of B=const - the appearance of the field-aligned currents is necessary. This appearance corresponds to the generation of the Alfvén wave.

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