Saturation of Magnetorotational Instability through Magnetic Field Generation

Autor:	Ebrahimi, F., Prager, S. C., Schnack, D. D.
Rok vydání:	2009
Předmět:	Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Solar and Stellar Astrophysics
Zdroj:	Astrophys.J.698:233-241,2009
Druh dokumentu:	Working Paper
DOI:	10.1088/0004-637X/698/1/233
Popis:	The saturation mechanism of Magneto-Rotational Instability (MRI) is examined through analytical quasilinear theory and through nonlinear computation of a single mode in a rotating disk. We find that large-scale magnetic field is generated through the alpha effect (the correlated product of velocity and magnetic field fluctuations) and causes the MRI mode to saturate. If the large-scale plasma flow is allowed to evolve, the mode can also saturate through its flow relaxation. In astrophysical plasmas, for which the flow cannot relax because of gravitational constraints, the mode saturates through field generation only. Comment: 9 pages, 10 figures to appear in ApJ, Jun 2009, 10 v698
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0904.2941 Zobrazit plný text záznamu View this record from Arxiv