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Solar Cycle Update - spotless
This is the first spotless day of the 24-25 solar minimum. Not a great deal can be read from that. According to Wilson, for cycles 9-14, sunspot minimum followed the first spotless day by about 72 months, having a range of 62-82 months; for cycles 15-21, sunspot minimum followed the first spotless day by about 35 months, having a range of 27-40 months. So we could still be six years from minimum making Solar Cycle 24 about 13 years long. Longer is weaker in the following cycle, and colder.