Table A4.

Total of 14 available proxies. For the SOLID database we truncate all proxies at 1969.

Name Full Name Provider Time interval
References and web sites
ISN International Sunspot Number WDC-SILSO 1818 – present
SILSO World Data Center (1970–2015) (full daily coverage since Dec. 1848)    
f10.7 10.7 cm Radio Flux Penticton 1947 – present
  Tapping (2013),,    
f3.2 3.2 cm Radio Flux Nobeyama 1950s – present
f8 8 cm Radio Flux    
f15 15 cm Radio Flux    
f30 30 cm Radio Flux    
MgII Mg II Core-to-Wing Ratio LASP, Boulder 1978 – present
  Viereck et al. (2004),    
MPSI Magnetic Plage Strength Index Mt. Wilson Obs. 1970–2013    
MWSI Mount Wilson Sunspot Index Mt. Wilson Obs. 1970–2013    
SEM 0-order Intensity in 26–34 nm Band SOHO/SEM 1995 – present
  Dominated by the Hell line    
CaK Normalized Intensity of Ca IIK Sacramento Peak 1976 – present
  Keil et al. (1998),,    
DSA Daily Sunspot Area Greenwich Obs. 1874 – present
  Wilson & Hathaway (2006),    
PSI Photometric Sunspot Index 1874–2013
Balmaceda et al. (2009)

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