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The critical intensity of Alfven waves for electron-cyclotron maser to favor the O-mode emission
Zhao, G. Q.1; Feng, H. Q.1; Wu, D. J.2
2015-10-01
发表期刊PHYSICS OF PLASMAS
卷号22期号:10
摘要The presence of Alfven 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, xi = B-w(2)/B-0(2), where B-w and B-0 are 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 xi similar to 10(-2) for 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. (C) 2015 AIP Publishing LLC.
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
DOI10.1063/1.4932325
关键词[WOS]POWER-LAW ELECTRONS ; ENERGY CUTOFF BEHAVIOR ; SOLAR-WIND ; CORONAL LOOPS ; RADIO-BURSTS ; NONTHERMAL ELECTRONS ; INSTABILITY ; RADIATION ; ACCELERATION ; TURBULENCE
收录类别SCI
语种英语
项目资助者NSFC(41504131 ; Program for Science and Technology Innovation Research Team in University of Henan Province(13IRTSTHN020) ; 41274180 ; 41231068 ; 11373070 ; 41531071)
WOS研究方向Physics
WOS类目Physics, Fluids & Plasmas
WOS记录号WOS:000364403600021
引用统计
被引频次:3[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://libir.pmo.ac.cn/handle/332002/16058
专题太阳和太阳系等离子体研究团组
作者单位1.Luoyang Normal Univ, Inst Space Phys, Luoyang, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing, Jiangsu, Peoples R China
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Zhao, G. Q.,Feng, H. Q.,Wu, D. J.. The critical intensity of Alfven waves for electron-cyclotron maser to favor the O-mode emission[J]. PHYSICS OF PLASMAS,2015,22(10).
APA Zhao, G. Q.,Feng, H. Q.,&Wu, D. J..(2015).The critical intensity of Alfven waves for electron-cyclotron maser to favor the O-mode emission.PHYSICS OF PLASMAS,22(10).
MLA Zhao, G. Q.,et al."The critical intensity of Alfven waves for electron-cyclotron maser to favor the O-mode emission".PHYSICS OF PLASMAS 22.10(2015).
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