Trends in the Revised Sunspot Number Dataset

Watts Up With That?

Guest essay by Jim Goodridge, former California State Climatologist

Hidden in the sunspot numbers are long-term trends. See the graph below.

Orbiting observatories since 1978 show solar irradiance and sunspot number are associated.


Sunspots have increased by 1 percent per year since 1700. This suggests recovery from the Little Ice Age of 1660 to 1710. A major increase in sunspot trend was observed from 1940 to 2002.

This is coinciding with the atmospheric CO2 increase. This suggests that the temperature-CO2 correlation is spurious, rather than causal.

Thanks to Dr. Leif Svalgaard for help in revising sunspot numbers.

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