Standing Alfvén waves with m ≫ 1 in a dipole magnetosphere with moving plasma and aurorae |
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Authors: | AS Leonovich DA Kozlov JB Cao |
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Institution: | 1. Institute of Solar-Terrestrial Physics (ISTP), Russian Academy of Sciences, Siberian Branch, Irkutsk, Russia;2. Key Laboratory for Space Weather, Chinese Academy of Science, Beijing, China;3. Russian–Chinese Joint Research Center on Space Weather |
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Abstract: | The structure of standing Alfvén waves with large azimuthal wave numbers (m ? 1) is studied in a dipole model of the magnetosphere with rotating plasma. In the direction across magnetic shells the structure of such waves is determined by their dispersion associated with curvature of geomagnetic field lines and corresponds to the travelling wave localized between toroidal and poloidal resonant surfaces. In projection into the ionosphere (along geomagnetic field lines) this structure is similar to the structure of a discrete auroral arc. The azimuthal structure of an auroral arc is similar to azimuthal structure of Alfvén waves with m ∼ 100. Possible interaction mechanisms between the Alfvén waves and energetic electron fluxes forming auroral arcs are discussed. |
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Keywords: | Magnetosphere Alfvé n waves Aurora |
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