Resonance instability of axially-symmetric magnetostatic equilibria

Details Resonance instability of axially-symmetric magnetostatic equilibria Resonance instability of axially-symmetric magnetostatic equilibria

2011-11-17

arxiv.org/abs/1111.4040v2

PhysRevE, 84, 056310 (2011)

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

7 pages, 5 figures, revtex4

Scientific paper

10.1103/PhysRevE.84.056310

We review the evidence for and against the possibility that a strong enough poloidal field stabilizes an axisymmetric magnetostatic field configuration. We show that there does exist a class of resonant MHD waves which produce instability for any value of the ratio of poloidal and toroidal field strength. We argue that recent investigations of the stability of mixed poloidal and toroidal field configurations based on 3-d numerical simulations, can miss this instability because of the very large azimuthal wave numbers involved and its resonant character.

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