发电机的转子角、转速，以及相关电气量，如线路功率、母线电压等发生近似等幅或增幅的振荡，因振荡频率较低，一般在0.1－2.5Hz，故称为低频振荡。
对于天气尺度系统，海温热力场则主要激发出大气低频振荡。
For synoptic scale systems, the SST thermal forcing mainly excites the atmospheric low - frequency oscillation.
对于天气尺度系统，海温热力场则主要激发出大气低频振荡。
For synoptic scale systems, the SST thermal forcing mainly excites the atmospheric low-frequency oscillation.
三波共振相互作用低频振荡周期与初始扰动振幅有很强的相关关系；
The low-frequency fluctuation periods and the initial amplitudes have close relationship in the resonance interaction.
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