ON THE RELATION OF STANDARD AND HELICAL MAGNETOROTATIONAL INSTABILITY
Journal Article
·
· Astrophysical Journal
- Dynamics and Vibrations Group, Technical University of Darmstadt, Hochschulstr. 1, 64289 Darmstadt (Germany)
- Forschungszentrum Dresden Rossendorf, P.O. Box 510119, D-01314 Dresden (Germany)
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 behavior 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 traveling wave (HMRI) and the excitation of HMRI in the inductionless limit. For certain parameter regions, we find new islands of the HMRI.
- OSTI ID:
- 21394291
- Journal Information:
- Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 712; ISSN ASJOAB; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
Similar Records
A UNIFYING PICTURE OF HELICAL AND AZIMUTHAL MAGNETOROTATIONAL INSTABILITY, AND THE UNIVERSAL SIGNIFICANCE OF THE LIU LIMIT
Identification of a non-axisymmetric mode in laboratory experiments searching for standard magnetorotational instability
Journal Article
·
Sat Sep 01 00:00:00 EDT 2012
· Astrophysical Journal
·
OSTI ID:22092419
Identification of a non-axisymmetric mode in laboratory experiments searching for standard magnetorotational instability
Journal Article
·
Mon Aug 08 20:00:00 EDT 2022
· Nature Communications
·
OSTI ID:1880388