PMO OpenIR  > 太阳和太阳系等离子体研究团组
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
Source PublicationPHYSICS OF PLASMAS
Volume22Issue:10
AbstractThe 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.
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1063/1.4932325
WOS KeywordPOWER-LAW ELECTRONS ; ENERGY CUTOFF BEHAVIOR ; SOLAR-WIND ; CORONAL LOOPS ; RADIO-BURSTS ; NONTHERMAL ELECTRONS ; INSTABILITY ; RADIATION ; ACCELERATION ; TURBULENCE
Indexed BySCI
Language英语
WOS Research AreaPhysics
WOS SubjectPhysics, Fluids & Plasmas
WOS IDWOS:000364403600021
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/16058
Collection太阳和太阳系等离子体研究团组
Affiliation1.Luoyang Normal Univ, Inst Space Phys, Luoyang, Peoples R China
2.Chinese Acad Sci, Purple Mt Observ, Nanjing, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
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).
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Zhao, G. Q.]'s Articles
[Feng, H. Q.]'s Articles
[Wu, D. J.]'s Articles
Baidu academic
Similar articles in Baidu academic
[Zhao, G. Q.]'s Articles
[Feng, H. Q.]'s Articles
[Wu, D. J.]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Zhao, G. Q.]'s Articles
[Feng, H. Q.]'s Articles
[Wu, D. J.]'s Articles
Terms of Use
No data!
Social Bookmark/Share
All comments (0)
No comment.
 

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.