The transformation of magnetoacoustic waves into Alfvén waves inside the magnetosphere |
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| Authors: | A E Kozlovsky V V Safargaleev W B Lyatsky |
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| Institution: | 1. Polar Geophysical Institute, 184200, Apatity, Murmansk Region, Russia
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| 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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