为了明确弱自转对电弧的螺旋不稳定性的影响，采用抛物型电导率和与时间有关的线性微扰理论，给出了有弱自转存在的热势分布（温度分布）、稳定性条件以及不稳定性增长率等定量结果；得出了迎着外加磁场方向，自转为顺时针方向时，稳定区域增大；反之，减小 In order to clarify the effect of weak rotation on the spiral instability of arc, the parabolic conductivity and the time-dependent linear perturbation theory are used to give the thermal distribution (temperature distribution), the stability condition and the stability condition Stability rate of growth and other quantitative results; come to meet the direction of the applied magnetic field, rotation for the clockwise direction, the stability of the region increases; the other hand, reduce