;Plage area composites created by Chatzistergos et al., 2020 ;"Analysis of full disc Ca II K spectroheliograms III. ;Plage area composite series covering 1892--2019". ; ;The archives included are those from the Arcetri (Ar), Baikal (Ba), ;Brussels (Br), Calern (CL), Catania (CT), Coimbra (Co), Kanzelhoehe (Ka), ;Kenwood (Ke), Kharkiv (Kh), Kislovodsk (Ki), Kodaikanal taken with the ;spectroheliograph (Ko), Kodaikanal taken with the Twin telescope (KT), ;Kodaikanal taken with the White-Light Active Region Monitor (WARM) ;telescope (KW), Kyoto (Ky), Manila (Ma), Mauna Loa (ML) taken with the ;Precision Solar Photometric Telescope (PSPT), McMath-Hulbert (MM), ;Mees (MS), Meudon taken with the spectroheliograph (MD1), Meudon ;taken with an interference filter (MD2), Mitaka taken with the ;spectroheliograph (Mi1), Mitaka taken with the Solar Flare ;Telescope with an interference filter (Mi2), Mt Wilson (MW), ;Pic du Midi (PM), SOlar Diameter Imager and Surface Mapper (SODISM) ;telescope on board the PICARD spacecraft (PS), Rome taken with the ;equatorial bar at Monte Mario (Ro), Rome taken with the PSPT (RP1), ;Rome taken with the PSPT with narrow bandwidth (RP2), ;Sacramento Peak (SP), San Fernando taken with the Cartesian ;Full-Disk Telescope (CFDT) 1 (SF1), San Fernando taken with the CFDT2 (SF2), Schauinsland (Sc), Teide (Te) taken with the ;Chromospheric Telescope (ChroTel), Upice (UP), Valasske Mezirici (VM), ;Wendelstein (WS), and Yerkes (YR) sites ; ;Version date: 04/05/2020 ;column 1: year, ;column 2: projected plage areas in disc fraction, ;column 3: corrected for foreshortening plage areas in microhemispheres ;-99 represents non-existent value ; 1892 0.011 0.012 1893 0.018 0.012 1894 0.030 0.020 1895 0.023 0.018 1896 -99.000 -99.000 1897 0.010 0.008 1898 0.019 0.014 1899 0.005 0.004 1900 0.010 0.008 1901 -99.000 -99.000 1902 0.007 0.006 1903 0.016 0.013 1904 0.016 0.012 1905 0.014 0.011 1906 0.013 0.010 1907 0.017 0.012 1908 0.020 0.015 1909 0.017 0.013 1910 0.012 0.009 1911 0.007 0.005 1912 0.006 0.004 1913 0.005 0.004 1914 0.008 0.006 1915 0.019 0.014 1916 0.022 0.017 1917 0.033 0.025 1918 0.029 0.022 1919 0.026 0.020 1920 0.021 0.015 1921 0.016 0.012 1922 0.011 0.008 1923 0.008 0.006 1924 0.009 0.008 1925 0.018 0.014 1926 0.029 0.023 1927 0.029 0.022 1928 0.034 0.025 1929 0.029 0.021 1930 0.018 0.013 1931 0.012 0.009 1932 0.010 0.007 1933 0.008 0.006 1934 0.008 0.007 1935 0.017 0.014 1936 0.035 0.027 1937 0.042 0.032 1938 0.042 0.032 1939 0.036 0.027 1940 0.030 0.022 1941 0.023 0.017 1942 0.015 0.012 1943 0.011 0.009 1944 0.009 0.006 1945 0.016 0.012 1946 0.034 0.027 1947 0.047 0.036 1948 0.041 0.031 1949 0.047 0.035 1950 0.030 0.023 1951 0.025 0.019 1952 0.015 0.011 1953 0.009 0.007 1954 0.008 0.006 1955 0.015 0.012 1956 0.044 0.035 1957 0.054 0.040 1958 0.054 0.040 1959 0.050 0.037 1960 0.043 0.031 1961 0.025 0.019 1962 0.020 0.015 1963 0.015 0.012 1964 0.009 0.007 1965 0.010 0.008 1966 0.019 0.015 1967 0.034 0.026 1968 0.032 0.024 1969 0.033 0.025 1970 0.036 0.028 1971 0.023 0.017 1972 0.026 0.020 1973 0.016 0.012 1974 0.015 0.012 1975 0.010 0.007 1976 0.011 0.008 1977 0.015 0.012 1978 0.036 0.028 1979 0.048 0.036 1980 0.049 0.036 1981 0.051 0.037 1982 0.046 0.033 1983 0.030 0.022 1984 0.023 0.018 1985 0.011 0.008 1986 0.008 0.006 1987 0.012 0.010 1988 0.032 0.025 1989 0.053 0.041 1990 0.043 0.033 1991 0.048 0.036 1992 0.035 0.025 1993 0.020 0.016 1994 0.014 0.011 1995 0.010 0.007 1996 0.007 0.005 1997 0.010 0.008 1998 0.028 0.023 1999 0.039 0.030 2000 0.045 0.034 2001 0.044 0.033 2002 0.044 0.032 2003 0.027 0.020 2004 0.022 0.016 2005 0.016 0.012 2006 0.010 0.007 2007 0.005 0.004 2008 0.001 0.001 2009 0.001 0.001 2010 0.009 0.007 2011 0.023 0.016 2012 0.024 0.018 2013 0.026 0.019 2014 0.033 0.025 2015 0.024 0.018 2016 0.013 0.009 2017 0.007 0.006 2018 0.004 0.003 2019 0.002 0.002