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Effects of power-law spectrum behaviors of nonthermal electrons on a ring-beam maser instability
Tang JianFei1,2,3; Wu DeJin1; Yan YiHua2
2012-04-01
Source PublicationSCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
ISSN1674-7348
Volume55Issue:4Pages:744-750
AbstractThe electron-cyclotron maser (ECM) emission driven by nonthermal electrons is one of the most crucial mechanisms responsible for radio emissions in magnetized planets, for the interplanetary medium (IPM) and for the laboratory microwave generation devices. Major astrophysical observations demonstrate that nonthermal electrons frequently have a negative power-law spectrum with a lower energy cutoff and anisotropic distribution in the velocity space. In this paper, the effects of power-law spectrum behaviors of electrons on a ring-beam maser emission are considered. The results show that the growth rates of O1 and X2 modes decrease rapidly for small Delta (the dispersion of momentum u). Because of the lower energy cutoff behavior, the nonthermal electrons with large Delta still can excite the ECM instability efficiently. The present analysis also includes the effects of parameter beta (beta u (0) is the dispersion of perpendicular momentum u (aSyen), u (0) the average value of u) on the instability. The growth rate of X2 mode decreases with parameter nu (0) (nu (0) = u (aSyen0)/u (0), u (aSyen0) is the average value of u (aSyen)). But for O1 mode, the relationship between the growth rate and nu (0) is complicated. It also shows that the growth rates are very sensitive to frequency ratio Omega (frequency ratio of electron cyclotron frequency to plasma frequency).
KeywordPower-law Lower Energy Cutoff Ring-beam Maser Emission
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1007/s11433-012-4683-z
WOS KeywordAURORAL KILOMETRIC RADIATION ; SOLAR RADIO-BURSTS ; EARTHS BOW SHOCK ; CYCLOTRON MASER ; DIRECT AMPLIFICATION ; RELATIVISTIC DISPERSION ; LOW CORONA ; EMISSION ; GENERATION ; DISTRIBUTIONS
Indexed BySCI
Language英语
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000301849800027
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8059
Collection太阳和太阳系等离子体研究团组
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China
3.Chinese Acad Sci, Grad Univ, Beijing 100039, Peoples R China
Recommended Citation
GB/T 7714
Tang JianFei,Wu DeJin,Yan YiHua. Effects of power-law spectrum behaviors of nonthermal electrons on a ring-beam maser instability[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2012,55(4):744-750.
APA Tang JianFei,Wu DeJin,&Yan YiHua.(2012).Effects of power-law spectrum behaviors of nonthermal electrons on a ring-beam maser instability.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,55(4),744-750.
MLA Tang JianFei,et al."Effects of power-law spectrum behaviors of nonthermal electrons on a ring-beam maser instability".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 55.4(2012):744-750.
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