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Table 2:

Correlation between L-band flux density and sunspot number (SSN).
Date L-Band Flux SSN Reference
  Density    
  mJy    
May 1975 (Kitt Peak) $\leq$10 $\pm$ 11.1 [1]
May 1997 (ISOPHOT) 7 18.5 $\pm$ 13.4 [2]
Aug 2002 (VLT) 20 116.4 $\pm$ 36.3 [3]
May 2007 (AKARI) 5.5 11.7 $\pm$ 6.8 [4]

Notes. L-band flux densities were estimated from the spectra shown in the relevant publications [1] Pilcher (1977), [2] Encrenaz et al. (2000a), [3] Feuchtgruber & Encrenaz (2003) and [4] This work. Monthly averages and standard deviation for SSN were taken from the International Sunspot Numbers, compiled by the Solar Influences Data Analysis Center in Belgium (http://solarscience.msfc.nasa.gov/greenwch/spot_num.txt).


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