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KINETIC ALFV´EN WAVES EXCITED BY OBLIQUE MAGNETOHYDRODYNAMIC ALFV´EN WAVES IN CORONAL HOLES
Zhao J. S. ; Wu D. J. ; Lu J. Y.
2011
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume735Pages:114(7)
AbstractKinetic Alfven waves (KAWs) are small-scale dispersive AWs that can play an important role in particle heating and acceleration of space and solar plasmas. An excitation mechanism for KAWs created by the coupling between large-scale oblique AWs and small-scale KAWs is presented in this paper. Taking into account both the collisional and Landau damping dissipations, the results show that the net growth rate of the excited KAWs increases with their perpendicular wavenumber k(perpendicular to) and reaches maximum at lambda(e)k(perpendicular to) similar to 0.3, where lambda(e) is the electron inertial length. However, for KAWs with shorter perpendicular wavelengths, the net growth rate decreases rapidly due to dissipative effects. The evaluation of the threshold amplitude of the AW implies that for KAWs with lambda(e)k(perpendicular to) < 0.3, the relative threshold amplitude is well below 10%, which is easy to satisfy. In particular, when applying this mechanism to the case of a solar coronal hole containing a dense plume structure, our results show that KAWs with lambda(e)k(perpendicular to) < 0.3 can be not only efficiently excited in the interplume region but also strongly dissipated in the dense plume due to the Landau damping.
KeywordFast Solar-wind Polar Plume Electron Acceleration Nonlinear Excitation Heavy-ions Quiet-sun Plasma Lines Generation Field
Subject AreaAstronomy & Astrophysics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/4494
Collection太阳和太阳系等离子体研究团组
Recommended Citation
GB/T 7714
Zhao J. S.,Wu D. J.,Lu J. Y.. KINETIC ALFV´EN WAVES EXCITED BY OBLIQUE MAGNETOHYDRODYNAMIC ALFV´EN WAVES IN CORONAL HOLES[J]. The Astrophysical Journal,2011,735:114(7).
APA Zhao J. S.,Wu D. J.,&Lu J. Y..(2011).KINETIC ALFV´EN WAVES EXCITED BY OBLIQUE MAGNETOHYDRODYNAMIC ALFV´EN WAVES IN CORONAL HOLES.The Astrophysical Journal,735,114(7).
MLA Zhao J. S.,et al."KINETIC ALFV´EN WAVES EXCITED BY OBLIQUE MAGNETOHYDRODYNAMIC ALFV´EN WAVES IN CORONAL HOLES".The Astrophysical Journal 735(2011):114(7).
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