Quote:
Originally Posted by dgavin
However I was only addressing what would be required of the total Solar output to effect a 1.8 degree change on earth. That part is bassed on the inverse square law.
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Well, if you take the excellent correlation between global temperature and solar irradiance from 1900 to 1940 and use it to calculate forcing, you get about 0.1 degree C per W/m^2 of increased solar irradiance (back of the envelope calculation from
this graph). That particular increase in irradiance was indeed accompanied by quite noticeable sun spot activity.
