We can see in this graph, plotted from Dr Preminger's calibrated database of Total Solar Irradiance and the UAH calibrated variation of the tropospheric temperature, that the climate of Earth depends directly on the intensity of solar irradiance.
All living organisms on Earth -and perhaps, also, on other cosmic bodies- depend on the energy of a star. The Sun is the unique source of energy for all organisms living on our planet. 1/50000000 part of the total incoming energy from the Sun hits the outermost external layer of the terrestrial atmosphere. As the solar radiation penetrates the atmosphere, it is scattered, reflected and absorbed by the constituents of the atmosphere. Only 50% of the energy that hits the outermost external layer of the atmosphere reaches the surface of Earth; however, only 1% of the energy is used by living organisms. Once the energy hits the surface, a percentage is absorbed by land and oceans and another percentage is reflected back towards outer space. Some of the absorbed energy is retained by the atmosphere, especially by water vapor, and is maintained for some time until it is emitted to cold space.
Thus, it is particularly important to study the anomalies of solar irradiance because any change in incoming solar energy affects not only the climate, but also all of life on Earth.