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On the relation of standard and helical magnetorotational instability

Kirillov, O. N. and Stefani, F. (2010):
On the relation of standard and helical magnetorotational instability.
712, In: The Astrophysical Journal, pp. 52-68, [Article]

Item Type: Article
Erschienen: 2010
Creators: Kirillov, O. N. and Stefani, F.
Title: On the relation of standard and helical magnetorotational instability
Language: English
Journal or Publication Title: The Astrophysical Journal
Volume: 712
Divisions: 16 Department of Mechanical Engineering > Dynamics and Vibrations
16 Department of Mechanical Engineering
Date Deposited: 19 Sep 2012 14:19
Identification Number: doi:10.1088/0004-637X/712/1/52
Alternative keywords:
Alternative keywordsLanguage
accretion, accretion disks – instabilities – magnetohydrodynamics (MHD) – turbulenceEnglish
Alternative Abstract:
Alternative abstract Language
The magnetorotational instability (MRI) plays a crucial role for cosmic structure formation by enabling turbulence in Keplerian disks which would be otherwise hydrodynamically stable. With particular focus on MRI experiments with liquid metals, which have small magnetic Prandtl numbers, it has been shown that the helical version of this instability (HMRI) has a scaling behaviour that is quite different from that of the standard MRI (SMRI). We discuss the relation of HMRI to SMRI by exploring various parameter dependencies. We identify the mechanism of transfer of instability between modes through a spectral exceptional point that explains both the transition from a stationary instability (SMRI) to an unstable travelling wave (HMRI) and the excitation of HMRI in the inductionless limit. For certain parameter regions we find new islands of the HMRI.English
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