On the dynamo driven accretion disks
文献类型：期刊论文
| 作者 | Ma, CY; Biermann, PL |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 1998-06-10 |
| 卷号 | 334期号:2页码:736-741 |
| 关键词 | magnetic fields MHD instabilities accretion, accretion disks turbulence |
| ISSN号 | 0004-6361 |
| 英文摘要 | We add the alpha- effect in the dynamo driven accretion disk model proposed by Tout & Pringle (1992), i.e., a dynamo model depends on the physical processes such as Parker instability, B-H instability, magnetic field reconnection and alpha-omega mean field dynamo as well. The alpha- effect in the dynamo mechanism is determined by the strength of turbulence of the accretion flow. When the turbulent Mach number M-t is less than 0.25, the solutions of the magnetic fields oscillate around their equilibrium values. Increasing the value of M-t makes the amplitude of the oscillation smaller and the period longer, but does not affect the equilibrium values. The Shakura-Sunyaev viscosity parameter alpha(SS) oscillates around the equilibrium value of 0.33. When the turbulent Mach number M-t is larger than 0.25, the magnetic field components reach a stable state. In the non-linear dynamo region, the critical turbulent Mach number M-t is 0.44 rather than 0.25. The oscillating magnetic fields and viscosity parameter can explain the basic properties of the dwarf nova eruptions and some properties of quiescent disks (Armitage al. 1996). |
| 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] | ACTIVE GALACTIC NUCLEI ; SCALE MAGNETIC-FIELDS ; BLACK-HOLES ; SIMPLE-MODEL ; TURBULENCE ; INSTABILITY ; STABILITY ; SYSTEMS |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000074460500045 |
| 公开日期 | 2013-02-05 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/8368]  |
| 专题 | 紫金山天文台_期刊（老文献） |
| 作者单位 | 1.Max Planck Inst Radioastron, D-53121 Bonn, Germany 2.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ma, CY,Biermann, PL. On the dynamo driven accretion disks[J]. ASTRONOMY & ASTROPHYSICS,1998,334(2):736-741. |
| APA | Ma, CY,&Biermann, PL.(1998).On the dynamo driven accretion disks.ASTRONOMY & ASTROPHYSICS,334(2),736-741. |
| MLA | Ma, CY,et al."On the dynamo driven accretion disks".ASTRONOMY & ASTROPHYSICS 334.2(1998):736-741. |
入库方式： OAI收割
来源：紫金山天文台
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