无论线性或非线性二阶变分都给出不稳定性判据。
The second variation, linear or nonlinear, gives the criteria of instability.
文中所用方法是普遍适用的，对各种可能的基流模型都可获得其不稳定性判据。
The method suggested in this palter is universal for obtaining criteria of instability in all models with all possible basic flows.
最后对回旋波色散关系进行了数值计算，得到了不稳定性判据和引起不稳定性的最佳值。
Finally, the numerical results are given for the dispersion relation of cyclotron waves, the criterion for this instability and the optimum value for generating it has been obtained.
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