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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 27, issue 10
Ann. Geophys., 27, 3875–3882, 2009
https://doi.org/10.5194/angeo-27-3875-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 27, 3875–3882, 2009
https://doi.org/10.5194/angeo-27-3875-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  12 Oct 2009

12 Oct 2009

Field-aligned structure of poloidal Alfvén waves in a finite pressure plasma

P. N. Mager1, D. Yu. Klimushkin1, V. A. Pilipenko2, and S. Schäfer3 P. N. Mager et al.
  • 1Institute of Solar-Terrestrial Physics, Russian Academy of Science, Siberian Branch, Irkutsk, P.O. Box 291, 664033, Russia
  • 2Space Research Institute, Moscow 117997, Russia
  • 3Institut für Geophysik und extraterrestrische Physik, TU Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany

Abstract. This paper is devoted to analytical and numerical studies of the parallel structure of poloidal Alfvén waves in a finite pressure plasma. The effects of finite-beta plasma are especially essential near the magnetospheric equator, where an opaque (non-transparent) region for Alfvén waves can be formed. This region is bounded by two turning points which restrain penetration of the wave energy far from the ionosphere, and an Alfvén resonator appears on a part of the field line adjacent to the ionosphere. Due to this effect the ULF pulsations in the Northern and Southern Hemispheres can be non-conjugated. Another result is a peculiar field-aligned structure of the wave magnetic field: its fundamental harmonic must have three nodes, rather than one node as is the case in cold plasma.

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