Saturation of magnetorotational instability through magnetic field generation

F. Ebrahimi, S. C. Prager, D. D. Schnack

Research output: Contribution to journalArticle

14 Scopus citations

Abstract

The saturation mechanism of magnetorotational instability (MRI) is examined through analytical quasi-linear theory and through nonlinear computation of a single mode in a rotating disk. We find that large-scale magnetic field is generated through the α-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.

Original languageEnglish (US)
Pages (from-to)233-241
Number of pages9
JournalAstrophysical Journal
Volume698
Issue number1
DOIs
StatePublished - 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Accretion, accretion disks
  • Instabilities
  • MHD
  • Magnetic fields

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