EFFECTS OF THE TEMPERATURE ANISOTROPY ON THE MASER INSTABILITY EXCITED BY LOWER ENERGY CUTOFF BEHAVIOR
文献类型：期刊论文
| 作者 | Tang, J. F.1,2,3; Wu, D. J.1; Yan, Y. H.2 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2011-02-01 |
| 卷号 | 727期号:2页码:70(5pp) |
| ISSN号 | 0004-637X |
| 关键词 | instabilities masers plasmas radiation mechanisms: non-thermal Sun: radio radiation |
| 英文摘要 | The electron-cyclotron maser (ECM) conventionally driven by velocity anisotropies of energetic electrons trapped in magnetic fields is one of the most important radio-emission mechanisms in astrophysics. Recently, Wu and Tang proposed that a proper lower energy cutoff behavior of power-law electrons can effectively excite the ECM emission. This paper considers effects of temperature anisotropy on this new ECM mechanism. The results show that the growth rates of the ECM emissions increase with beta(perpendicular to 0) and beta(parallel to 0), where beta(perpendicular to 0) and beta(parallel to 0) are the perpendicular and parallel velocity spreads (in units of the light velocity c) of the energetic electron beam, respectively. Moreover, the growth rates of O1 and X2 modes both sensitively depend on the ratio of the electron-cyclotron frequency to the plasma frequency Omega and reach their extremum values at Omega similar or equal to 1.5 for the O1 mode and at Omega similar or equal to 1.0 for the X2 mode. Meanwhile, as the mean velocity of the electron beam beta(s) (in units of c) increases, the growth rate of the O1 mode remains approximately constant and that of the X2 mode decreases considerably. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ELECTRON-CYCLOTRON MASER ; POWER-LAW ELECTRONS ; SOLAR RADIO-BURSTS ; TERRESTRIAL KILOMETRIC RADIATION ; DIRECT AMPLIFICATION ; MAGNETIC FIELD ; EMISSION ; PLASMA ; DISTRIBUTIONS ; MODES |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000286662000009 |
| 公开日期 | 2012-08-07 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/4501]  |
| 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.CAS, Purple Mt Observ, Nanjing 210008, Peoples R China 2.Chinese Acad Sci, Natl Astron Observ, Key Lab Solar Act, Beijing 100012, Peoples R China 3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tang, J. F.,Wu, D. J.,Yan, Y. H.. EFFECTS OF THE TEMPERATURE ANISOTROPY ON THE MASER INSTABILITY EXCITED BY LOWER ENERGY CUTOFF BEHAVIOR[J]. ASTROPHYSICAL JOURNAL,2011,727(2):70(5pp). |
| APA | Tang, J. F.,Wu, D. J.,&Yan, Y. H..(2011).EFFECTS OF THE TEMPERATURE ANISOTROPY ON THE MASER INSTABILITY EXCITED BY LOWER ENERGY CUTOFF BEHAVIOR.ASTROPHYSICAL JOURNAL,727(2),70(5pp). |
| MLA | Tang, J. F.,et al."EFFECTS OF THE TEMPERATURE ANISOTROPY ON THE MASER INSTABILITY EXCITED BY LOWER ENERGY CUTOFF BEHAVIOR".ASTROPHYSICAL JOURNAL 727.2(2011):70(5pp). |
入库方式： OAI收割
来源：紫金山天文台
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