Effects of power-law spectrum behaviors of nonthermal electrons on a ring-beam maser instability

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 太阳和太阳系等离子体研究团组

	Effects of power-law spectrum behaviors of nonthermal electrons on a ring-beam maser instability
	Tang JianFei 1,2,3; Wu DeJin1 ; Yan YiHua 2
刊名	SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
	2012-04-01
卷号	55 期号:4 页码:744-750
关键词	power-law lower energy cutoff ring-beam maser emission
ISSN号	1674-7348
英文摘要	The 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).
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Physics, Multidisciplinary
研究领域[WOS]	Physics
关键词[WOS]	AURORAL KILOMETRIC RADIATION ; SOLAR RADIO-BURSTS ; EARTHS BOW SHOCK ; CYCLOTRON MASER ; DIRECT AMPLIFICATION ; RELATIVISTIC DISPERSION ; LOW CORONA ; EMISSION ; GENERATION ; DISTRIBUTIONS
收录类别	SCI
语种	英语
WOS记录号	WOS:000301849800027
公开日期	2013-01-31
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/8059]
专题	紫金山天文台_太阳和太阳系等离子体研究团组
作者单位	1.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
推荐引用方式 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.