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The current cycle minimum appears to be deeper and broader than recent cycleminima, and this minimum appears similar to the minima in the early 1900s. Withthe best-ever solar irradiance measurements from several different satelliteinstruments, this minimum offers a unique opportunity to advance ourunderstanding of secular (long-term) changes in the solar irradiance.Comparisons of the 2007-2009 irradiance results to the irradiance levels duringthe previous minimum in 1996 suggest that the solar irradiance is lower in thiscurrent minimum. For example, the total solar irradiance (TSI) indicates lowerirradiance in 2008 than in 1996 by about 200 ppm, and the SOHO Solar EUVMonitor (SEM) 26 to 34 nm irradiance is about 15% lower in 2008 than in 1996.However, these irradiance variations have 30-50% uncertainties due to theseresults depending strongly on instrument degradation trends over 12 years.Supporting evidence for lower irradiance include that the solar magnetic fieldsare lower and that there are more low-latitude coronal holes during thiscurrent minimum.

Irradiance Variations During This Solar Cycle Minimum