Intermittency is a behavior of dynamical systems: regular alternation of phases of apparently periodic and chaotic dynamics. Intermittent or intermittency may also refer to: Intermittent river or stream, the one that ceases to flow every year or at least twice every five years Intermittent energy source, renewable energy sources that are not dispatchable due to their fluctuating nature Intermittent fault, malfunction of a device or system that occurs at intervals, usually irregular Fluorescence intermittency, or blinking, is random switching between ON (bright) and OFF (dark) states Intermittent control, possibilities between the two extremes of continuous-time and discrete-time control: the control signal .