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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 30, issue 7
Ann. Geophys., 30, 1099–1106, 2012
https://doi.org/10.5194/angeo-30-1099-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 30, 1099–1106, 2012
https://doi.org/10.5194/angeo-30-1099-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Regular paper 25 Jul 2012

Regular paper | 25 Jul 2012

Spatio-temporal structure of Alfvén waves excited by a sudden impulse localized on an L-shell

D. Yu. Klimushkin1, P. N. Mager1, and K.-H. Glassmeier2 D. Yu. Klimushkin et al.
  • 1The Institute of Solar-Terrestrial Physics of Siberian Branch of Russian Academy of Sciences, P.O. Box 291, 664033 Irkutsk, Russia
  • 2Institut für Geophysik und Extraterrestrische Physik, Mendelssohnstrasse 3, 38106 Braunschweig, Germany

Abstract. This paper is concerned with the spatial structure and temporal evolution of the azimuthally small scale Alfvén wave generated by a sudden impulse concentrated on a given magnetic shell. At the outset, both poloidal and toroidal components are present in the wave's magnetic field. The oscillation in the poloidal component on a given magnetic shell is a superposition of two monochromatic oscillations, one with the local resonance frequency on this shell, and the other with the frequency corresponding to the resonance frequency on the source surface. The superposition of these two oscillations leads to beating. Due to phase mixing, the poloidal component of the oscillation decreases with time down to zero, transferring its energy to the toroidal component. Beating in the toroidal component is less pronounced. As time elapses, energy concentration near the source magnetic shell occurs with the frequency of the oscillation corresponding to the Alfvénic resonance frequency on this surface. Outside this thin region wave amplitudes become rather small at oscillation frequencies corresponding to the local resonance frequency of the respective magnetic shell.

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