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The relative distribution of pooled variance at different time scales for some 40 lower main sequence stars observed at Mt Wilson Observatory are used to derive estimates for the lifetimes of chromospheric active regions and active region complexes. For the sample stars, the time scale of AR evolution is approximately 50 days, while the lifetime of AR complexes is on the order of 1 year. These estimates can be used to clarify the contribution of active regions to short-term (i.e., less than 1 y) time series data.
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