Heating and acceleration of ions in nonresonant Alfvénic turbulence
Heating and acceleration of ions in nonresonant Alfvénic turbulence
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DOI：
10.1063/1.3449592
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发表时间：
2010-07
影响因子：
2.2
通讯作者：
Y. Nariyuki;T. Hada;K. Tsubouchi
中科院分区：
文献类型：
--
作者：
Y. Nariyuki;T. Hada;K. Tsubouchi
Nonlinear scattering of protons and alpha particles during the dissipation of the finite amplitude, low-frequency Alfvenic turbulence is studied. The process discussed here is not the coherent scattering and acceleration, as those often treated in the past studies, but is an incoherent process in which it is essential that the Alfvenic turbulence has a broadband spectrum. The presence of such an Alfvenic turbulence is widely recognized observationally both in the solar corona and in the solar wind. Numerical results suggest that, although there is no apparent sign of the occurrence of any parametric instabilities, the ions are heated efficiently by the nonlinear Landau damping, i.e., trapping and phase mixing by Alfven wave packets which are generated by beating of finite amplitude Alfven waves. The heating occurs both in the parallel and in the perpendicular directions, and the ion distribution function which is asymmetric with respect to the parallel velocity is produced. Eventual perpendicular energy o...
