Bonanno Alfio, Urpin Vadim
INAF, Osservatorio Astrofisico di Catania, Catania, Italy.
Phys Rev E Stat Nonlin Soft Matter Phys. 2011 Nov;84(5 Pt 2):056310. doi: 10.1103/PhysRevE.84.056310. Epub 2011 Nov 16.
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 magnetohydrodynamic (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 three-dimensional numerical simulations can miss this instability because of the very large azimuthal wave numbers involved and its resonant character.
我们回顾了关于足够强的极向场能否稳定轴对称静磁场构型这一可能性的支持和反对证据。我们表明，确实存在一类共振磁流体动力学（MHD）波，对于极向场和环向场强度之比的任何值，这类波都会产生不稳定性。我们认为，最近基于三维数值模拟对混合极向场和环向场构型稳定性的研究可能会忽略这种不稳定性，因为其中涉及非常大的方位波数及其共振特性。
