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arXiv:astro-ph/0405228 (astro-ph)
[Submitted on 12 May 2004]

Title:Seed fields for galactic dynamos by the magnetorotational instabilities

Authors:L.L. Kitchatinov, G. Rüdiger
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Abstract: A linear but global numerical model for the magnetorotational instability (MRI) in disk geometry is considered to estimate the instability parameters for galaxies. Similarity rules suggested by a local analysis are applied to reveal a universal behavior approached by the results of global calculations for large magnetic Prandtl numbers. The findings are used to estimate the MRI characteristics for galaxies with their very large magnetic Prandtl numbers which cannot be attained in any numerical simulations. The resulting minimum field for the instability, Bmin 10-25 G, is small compared to any seed fields currently discussed. The growth times of MRI are estimated to be on the order of the rotation period of the inner rigidly-rotating core, i.e. ~100 Myr. Global MRI excites preferentially the magnetic field modes of quadrupolar symmetry.
Comments: 6 pages, 4 figures, Astron. Astrophys. (acc.)
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0405228
  (or arXiv:astro-ph/0405228v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0405228
Journal reference: Astron.Astrophys. 424 (2004) 565-570
Related DOI: https://doi.org/10.1051/0004-6361%3A20040431

Submission history

From: Guenther Ruediger [view email]
[v1] Wed, 12 May 2004 13:55:23 UTC (106 KB)
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