  The attribution of part of global warming to changes in the total solar
irradiance (TSI) is an important topic which is not, yet, fully understood.
Here, we examine the TSI induced temperature (T) changes on a variety of time
scales, from one day to centuries and beyond, using a variety of assumptions.
Also considered is the latitude variation of the T-TSI correlations, where it
appears that over most of the globe there is a small increase in the
sensitivity of temperature to TSI in time. It is found that the mean global
sensitivity (alpha)measured in K(Wm-2)-1 varies from about 0.003 for 1 day, via
0.05 for 11-years to about 0.2 for decades to centuries. We conclude that mean
global temperature changes related to TSI are not significant from 1975
onwards.
  Before 1975, when anthropogenic gases were less important, many of the
temperature changes can be attributed to TSI variations. Over much longer
periods of time, from Kyear to Myear, the TSI changes are more efficient still,
the sensitivity alpha increasing ro about 0.5. Since 1975 the changes in mean
global temperature are not due to TSI changes, but rather to the increasing
atmospheric CO2 content.
