圆柱几何中压力驱动的不稳定性：一个新的通用判据
Pressure-driven Instabilities in Cylindrical Geometry: A New General Criterion
摘要：
基于能量原理的交替使用，导出了圆柱形几何中压力驱动交换不稳定性的新判据。该判据与Suydam判据不等价，且不包含磁剪切。事实上，它表明，Suydam的标准涉及到慢磁声分支的不稳定性，而本标准涉及到Alfvénic的，这是最危险的两个。这些研究结果解释了为什么压力驱动模式几乎总是存在，即使Suydam的标准是由一个大的利润满足。
英文摘要：
A new criterion for pressure-driven interchange instabilities in cylindrical geometry is derived, based on an alternate use of the Energy Principle. This criterion is inequivalent to Suydam's criterion and does not contain the magnetic shear. In fact, it is shown that Suydam's criterion relates to the instability of the slow magnetosonic branch, while the present criterion relates to the Alfvénic one, which is the most dangerous of the two. These findings explain why pressure-driven modes nearly always exist even if Suydam's criterion is satisfied by a large margin.
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