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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 29, issue 6
Ann. Geophys., 29, 1179-1188, 2011
https://doi.org/10.5194/angeo-29-1179-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 29, 1179-1188, 2011
https://doi.org/10.5194/angeo-29-1179-2011
© Author(s) 2011. This work is distributed under
the Creative Commons Attribution 3.0 License.

  29 Jun 2011

29 Jun 2011

On the nature of particle energization via resonant wave-particle interaction in the inhomogeneous magnetospheric plasma

D. R. Shklyar D. R. Shklyar
  • Space Research Institute of RAS (IKI), Moscow, Russia
  • also at: Moscow Physical Technical Institute (MPTI), Russia

Abstract. When a quasi-monochromatic wave propagating in an inhomogeneous magnetoplasma has sufficiently large amplitude, there exist phase-trapped resonant particles whose energy increases or decreases depending on the "sign" of inhomogeneity. The variation of energy density of such particles can greatly exceed the wave energy density which contradicts energy conservation under the prevalent assumption that the wave serves as the energy source or sink. We show that, in fact, the energy increase (or decrease) of phase-trapped particles is related to energy transfer from (to) phase untrapped particles, while the wave basically mediates the energization process. Virtual importance of this comprehension consists in setting proper quantitative constraints on attainable particle energy. The results have immediate applications to at least two fundamental problems in the magnetospheric physics, i.e. particle dynamics in the radiation belts and whistler-triggered emissions.

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