Extending the Range of the Inductionless Magnetorotational Instability

Kirillov, Oleg and Stefani, Frank (2013) Extending the Range of the Inductionless Magnetorotational Instability. Physical Review Letters, 111 (6). 061103. ISSN 0031-9007

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Official URL: http://dx.doi.org/10.1103/PhysRevLett.111.061103

Abstract

The magnetorotational instability (MRI) can destabilize hydrodynamically stable rotational flows, thereby allowing angular momentum transport in accretion disks. A notorious problem for the MRI is its questionable applicability in regions with low magnetic Reynolds number. Using the WKB method, we extend the range of applicability of the MRI by showing that the inductionless versions of the MRI, such as the helical MRI and the azimuthal MRI, can easily destabilize Keplerian profiles if the radial profile of the azimuthal magnetic field is only slightly modified from the current-free profile. This way we further show how the formerly known lower Liu limit of the critical Rossby number connects naturally with the upper Liu limit.

Item Type: Article
Subjects: F300 Physics
F500 Astronomy
Department: Faculties > Engineering and Environment > Mathematics and Information Sciences
Depositing User: Oleg Kirillov
Date Deposited: 10 Jan 2017 11:23
Last Modified: 15 May 2017 03:44
URI: http://nrl.northumbria.ac.uk/id/eprint/29034

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