Effects of power-law spectrum behaviors of nonthermal electrons on a ring-beam maser instability
文献类型：期刊论文
| 作者 | Tang JianFei1,2,3; Wu DeJin1; Yan YiHua2
|
| 刊名 | SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
 |
| 出版日期 | 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 |
| 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). |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000301849800027 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6310]  |
| 专题 | 国家天文台_太阳物理研究部 |
| 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. |
入库方式： OAI收割
来源：国家天文台
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