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Pitch-angle diffusion of ions via nonresonant interaction with Alfvénic turbulence

Phys. Plasmas 16, 102102 (2009); doi:10.1063/1.3236749

Published 8 October 2009

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P. H. Yoon,1,2 C. B. Wang,3 and C. S. Wu2,3
1School of Space Research, Kyung Hee University, Yongin, Gyeonggi 446-701, Korea
2Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA
3CAS Key Laboratory of Basic Plasma Physics, School of Earth and Space Sciences, University of Science and Technology of China, Hefei, Anhui 230026, China
The present discussion revisits the problem of nonresonant heating of ions by Alfvénic turbulence. It is shown that in the limit of weak Alfvénic turbulence it is appropriate to describe the nonresonant heating of protons as perpendicular pseudoheating. However, in a more general situation it is demonstrated that the more appropriate view of the nonresonant heating process is the pitch-angle scattering in the wave frame. The purpose of this paper is to generalize the earlier theory to the case in which the energy density of the turbulent Alfvén waves is not necessarily very low. For weakly turbulent situation the present analysis confirms the earlier finding by Wu and Yoon [Phys. Rev. Lett. 99, 075001 (2007)], according to whom the nonresonant Alfvén wave heating is described as leading to perpendicular pseudoheating of the protons. However, for more general situation the present paper demonstrates that pitch-angle scattering plays the principal role in the Alfvén wave pseudoheating process, and thereby shows that the perpendicular heating discussed by Wu and Yoon is kinetic in nature, not attributable to fluid motion. ©2009 American Institute of Physics
History: Received 24 July 2009; accepted 3 September 2009; published 8 October 2009
Permalink: http://link.aip.org/link/?PHPAEN/16/102102/1
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KEYWORDS and PACS

Keywords
PACS
  • 52.35.Ra
    Plasma turbulence
  • 52.35.Mw
    Nonlinear phenomena: plasma waves, wave propagation and other interactions
  • YEAR: 2009

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ISSN:
1070-664X (print)   1089-7674 (online)
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REFERENCES (17)
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