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ELECTRON CYCLOTRON MASER INSTABILITY IN SPACE PLASMAS WITH KAPPA LOSS-CONE DISTRIBUTION
Tang, J. F.1,2,3; Wu, D. J.1; Yan, Y. H.2
2012-02-01
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume745Issue:2Pages:134(5pp)
AbstractIt is well known that non-thermal electrons, often modeled by the kappa distribution, are ubiquitously observed in space. Kappa-type distributions have been widely discussed in various plasma environments. On the other hand, when these non-thermal electrons are trapped by magnetic fields in space they frequently have a loss-cone distribution in velocity space. In this paper, we investigated the growth rates of electron cyclotron maser (ECM) instability in space plasmas by using a kappa loss-cone distribution. Based on the cold plasma assumption and weakly relativistic approximation, the results show that non-thermal electrons with such a distribution can excite ECM emission efficiently. The growth rates of O1 and X2 modes both increase with the kappa spectral index (kappa) but the growth rate of X2 mode increases slightly more rapidly than that of O1 mode. The present analysis also shows that the growth rates increase rapidly with the loss-cone index sigma for sigma < 10 but increase comparatively slowly for larger sigma values.
KeywordInstabilities Masers Plasmas Radiation Mechanisms: Non-thermal Sun: Radio Radiation
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1088/0004-637X/745/2/134
WOS KeywordTERRESTRIAL KILOMETRIC RADIATION ; POWER-LAW ELECTRONS ; SOLAR RADIO-BURSTS ; DIRECT AMPLIFICATION ; EMISSION ; GENERATION ; DRIVEN ; WAVES
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000300326800032
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8061
Collection太阳和太阳系等离子体研究团组
Affiliation1.CAS, Purple Mt Observ, Nanjing 210008, Peoples R China
2.CAS, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Tang, J. F.,Wu, D. J.,Yan, Y. H.. ELECTRON CYCLOTRON MASER INSTABILITY IN SPACE PLASMAS WITH KAPPA LOSS-CONE DISTRIBUTION[J]. ASTROPHYSICAL JOURNAL,2012,745(2):134(5pp).
APA Tang, J. F.,Wu, D. J.,&Yan, Y. H..(2012).ELECTRON CYCLOTRON MASER INSTABILITY IN SPACE PLASMAS WITH KAPPA LOSS-CONE DISTRIBUTION.ASTROPHYSICAL JOURNAL,745(2),134(5pp).
MLA Tang, J. F.,et al."ELECTRON CYCLOTRON MASER INSTABILITY IN SPACE PLASMAS WITH KAPPA LOSS-CONE DISTRIBUTION".ASTROPHYSICAL JOURNAL 745.2(2012):134(5pp).
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