Model of auroral electron acceleration by dissipative nonlinear inertial Alfven wave
文献类型：期刊论文
| 作者 | Wu, DJ ; Chao, JK
|
| 刊名 | JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
 |
| 出版日期 | 2004-06-22 |
| 卷号 | 109期号:A6页码:A06211 |
| 关键词 | auroral phenomena energetic particle precipitating magnetosphere-ionosphere interactions kinetic and MHD theory nonlinear phenomena |
| ISSN号 | 0148-0227 |
| 英文摘要 | In a recent work [Wu, 2003a, 2003b], a dissipative nonlinear inertial Alfven wave (DNIAW) were proposed as the physical explanation for the formation of the strong electric spikes often observed in the auroral ionosphere and the magnetosphere. DNIAW can also lead to the field_aligned electron acceleration. In the present paper, dynamical characteristics of DNIAW acceleration are discussed and its possible role in auroral electron acceleration is further investigated. The effective acceleration region for auroral electrons with energies of the order of keV produced by DNIAW acceleration is between 0.5 and 2.5 R-E above the ionosphere, and the most efficient acceleration occurs around 0.8 R-E where both the Alfven velocity and the produced auroral electron energy peak, and the peak energy is around 10 keV. We suggest that this could explain the precipitous decrease of the auroral electron energy spectrum toward energies above 10 keV, which can be inferred from measurements of energy distribution of precipitating auroral electrons. Typical widths of auroral arcs caused by the DNIAW acceleration are in scales of the order of 1 km. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | ION-ACOUSTIC-WAVES ; LOW-BETA-PLASMA ; PARTICLE-ACCELERATION ; ANOMALOUS RESISTIVITY ; DOUBLE-LAYERS ; IONOSPHERE ; TEMPERATURE ; ALTITUDE ; DENSITY ; SHOCKS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000222778000002 |
| 公开日期 | 2012-12-22 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/7761]  |
| 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, Peoples R China 2.Natl Cent Univ, Inst Space Sci, Chungli 32001, Taiwan 3.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wu, DJ,Chao, JK. Model of auroral electron acceleration by dissipative nonlinear inertial Alfven wave[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2004,109(A6):A06211. |
| APA | Wu, DJ,&Chao, JK.(2004).Model of auroral electron acceleration by dissipative nonlinear inertial Alfven wave.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,109(A6),A06211. |
| MLA | Wu, DJ,et al."Model of auroral electron acceleration by dissipative nonlinear inertial Alfven wave".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 109.A6(2004):A06211. |
入库方式： OAI收割
来源：紫金山天文台
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