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题名: The critical intensity of Alfvén waves for electron-cyclotron maser to favor the O-mode emission
作者: Zhao, G.Q. ; Feng, H.Q. ; Wu DeJin(吴德金)
刊名: Physics of Plasmas
出版日期: 2015
卷号: 22, 期号:10, 页码:0
学科分类: 天文和天体物理
文章类型: 期刊论文
英文摘要: The presence of Alfvén waves (AWs) has been found to significantly affect electron-cyclotron maser (ECM), which is a powerful emission mechanism in astrophysical plasmas. A conventional ECM driven by power-law electrons with a lower-energy cutoff generally prefers X-mode emission to O-mode. In particular, the ECM possibly favors O-mode because it is dependent on the relative intensity of the present AWs, ξ=Bw2/B02, where Bwand B0are the field strength of AWs and the ambient magnetic field, respectively. This paper, for the first time, quantitatively investigates the critical relative intensity of AWs, above which the ECM becomes to favor the O-mode emission. It is found that the critical intensity depends on velocity distribution function features of energetic electrons, as well as on ambient plasma parameters. In principle, the critical intensity is in the order of ξ ∼ 10-2for power-law electrons with a lower energy cutoff, when the fundamental wave in X-mode is suppressed. Moreover, the incorporation of the loss cone distribution caused by the magnetic mirror effect can considerably lower the critical intensity of AWs. This study contributes to the understanding of solar type I radio storm emissions, which are dominated by the O-mode. © 2015 AIP Publishing LLC.
收录类别: SCI
所属项目名称: PMO_LIB-IR
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/14842
Appears in Collections:太阳和太阳系等离子体研究团组_期刊论文

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