文献类型：期刊文献

英文题名：Ion flow driven by low frequency Alfven waves in a low-beta plasma

作者：Lu, X. Q.[1];Yu, L. M.[2];Guo, W.[1];Li, K. H.[3]

机构：[1]Yantai Univ, Coll Nucl Equipment & Nucl Engn, Yantai 264005, Peoples R China;[2]East China Univ Sci & Technol, Dept Phys, Shanghai 200237, Peoples R China;[3]Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China

年份：2021

卷号：28

期号：2

外文期刊名：PHYSICS OF PLASMAS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000630907200001)】；

基金：This manuscript is based upon work supported by the National Key Research and Development Program of China under Grant No. 2017YFE0302000, the Natural Science Foundation of Hunan Province (No. 2020JJ4075), and the Key Projects of Hunan Provincial Department of Education (No. 18A238).

语种：英文

摘要：In a low-beta plasma, the ion flow in the parallel direction along the background magnetic field is investigated when ions are accelerated by low-frequency polarized Alfven waves with the finite amplitude propagating along the magnetic field due to nonresonant interactions. The results indicate that the magnitude of the ion flow is closely related to not only the amplitude but also the frequency and the polarization of the wave, which is verified by a test particle simulation. The ion flows driven by the nondispersive and dispersive Alfven waves are proportional to vAa2 o16eTHORN2 and vAa2 o16eTHORN3=2, respectively, where a is the ratio of the magnetic field component of the Alfven wave to the background magnetic field, e is the ratio of the wave frequency to the ion cyclotron frequency, and the positive sign corresponds to the right-handed Alfven wave and the negative sign corresponds to the left-handed Alfven wave, respectively. For a wave with finite frequency, the ion flow is different from different polarized waves in low beta plasmas. In particular, the saturation value of ion flow has a minimum threshold for the lefthanded polarized Alfven wave and a maximum threshold for the right-handed polarized Alfven wave. If the frequency is less than 1/10 of the ion cyclotron frequency, the Alfven wave can be seen as propagating in nondispersive medium. When the frequency of the Alfven wave is far less than the frequency of the ion cyclotron, the ion flows driven by the left-handed and right-handed polarized Alfven waves with and without wave dispersion tend to be the same.