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On the dynamo driven accretion disks
Ma, CY; Biermann, PL
1998-06-10
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN0004-6361
Volume334Issue:2Pages:736-741
AbstractWe 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).
KeywordMagnetic Fields Mhd Instabilities Accretion, Accretion Disks Turbulence
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordACTIVE GALACTIC NUCLEI ; SCALE MAGNETIC-FIELDS ; BLACK-HOLES ; SIMPLE-MODEL ; TURBULENCE ; INSTABILITY ; STABILITY ; SYSTEMS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000074460500045
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/8368
Collection期刊(老文献)
Affiliation1.Max Planck Inst Radioastron, D-53121 Bonn, Germany
2.Acad Sinica, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
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.
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