A new linear analysis for magnetic helical instabilities of arcdischarges in a cylindrical plasma is developed based on a set of electrostatic magnetohydrodynamic equations.
在静电磁流体方程基础上，提出了柱状放电电弧等离子体磁螺旋不稳定性的一种新的线性分析方法。
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Arcdischarges accompany with ultraviolet (UV) radiation. By detecting the radiation intensity of arc discharge the damage degree of arc to electrical equipments can be predicted.