FIGURE 3. Variations in total solar irradiance.
From the following article:
Variations in solar luminosity and their effect on the Earth's climate
P. Foukal, C. Fröhlich, H. Spruit and T. M. L. Wigley
Nature 443, 161-166(14 September 2006)
doi:10.1038/nature05072
Lower panel, a comparison of radiometrically measured TSI variation5 as daily values (light blue) and as 81-day smoothed curve (dark blue). Also plotted are TSI reconstructed from contributions of sunspots, faculae and network10 (red curve) and from Kitt Peak magnetograms11. Differences between the red and green curves illustrate remaining uncertainties in the reconstruction of TSI variation over the 11-year cycle. The upper panels illustrate fluctuations due to spots and magnetic brightenings moving across the solar disk on the 27-day solar rotational timescale, with daily TSI values on an expanded timescale during a solar maximum (1991) and minimum (1996). Again, the reconstructions are also plotted for comparison.
