| Details1: | Several researchers have noted that the 11-year solar cycle does not show up in temperature or precipitation data. Most recently, Dr. David Evans has introduced his “notch filter” answer to the problem. I think the answer is much simpler.
The solar influence on earth has several components. The Total Solar Insolation (TSI), varies over the 11-year solar cycle by about 0.1%. Solar UV varies by much more, up to 10%, but those wavelengths carry much less energy than TSI, and affect only the top of the atmosphere. The solar wind has little energy, but influences the cosmic ray influx. Other influx, such as Forbush Events, from Coronal Mass Ejections (CME’s), have short term effects. These last two, the solar wind and Forbush Events, do not follow the solar cycle very closely, so tend not to show up in a time power spectrum of climate, or even of cosmic rays.
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