Solar Calcium Data (All ftp)

• The Apn data include both the Active Region (AR) calcium plage areas, as in the Ap, and also the areas of the active network. The Apn is NOT corrected for foreshortening (useful for irradiance models) and so is expressed in fractions of the solar disk. The basic reduction procedure is given in GRL 25, 2909 (1998), but the values were revised somewhat in a later paper in GRL 29, 2089 (2002). The annual means of these data agree very well with the independent time series of the Mt. Wilson areas by Ulrich et al., and by Tlatov et al. -- see paper by P. Foukal, Solar Physics 255, 229 (2009). The data are plain text files of monthly mean and annual mean values of (plage + active network) areas, covering the period 8/1915 - 12/1999 inclusive, and expressed as fractions of the solar disc (i.e. not corrected for foreshortening). Data prior through 1984 are means of daily Mt. Wilson measurements; data after 1984 are based on four roughly evenly spaced days per month using Sacramento Peak observations.
• Monthly Calcium Plage and Network Areas (in fractions of solar disk) in data and plot (pdf file) form
• Smoothed Monthly Calcium Plage and Network Areas (in fractions of solar disk) in data and plot (pdf file) form
• Plot of both the smoothed and unsmoothed Apn with International Sunspot Number -- Calcium Plage and Network Areas (in fractions of solar disk) plot
  
  

• The following Ap daily data (no network included) are corrected for foreshortening, and so are expressed in fraction of a hemisphere. It is important to stress that these are just areas of the Active Region (AR) plages -- just like the McMath Plage Index (except the McMath Index incorporates estimates of brightness, whereas Ap is just area). The reference for these data is the GRL 23, 2169 (1996) paper by P. Foukal. Both the McMath index and the Ap are of limited use now that the Apn (area of plage plus active network) is available.
• Descriptive Text for the Ap data.
• Annual values of the calcium plage area, corrected for foreshortening, in fraction of the solar hemisphere (ASCII) >
• Monthly values of the calcium plage area, corrected for foreshortening, in fraction of the solar hemisphere (ASCII)
• Daily values of the calcium plage area by year (Format is YYYYMMDD and corrected daily area)
  • 1915 1916 1917 1918 1919
  • 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929
  • 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939
  • 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949
  • 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959
  • 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969
  • 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979
  • 1980 1981 1982 1983 1984

• Descriptive text
• Data for 1988-1998 -- daily areas and irradiance indices, such as the excess spectral irradiance in the K line 393.4 nm (ASCII)

• Descriptive text
• McMath data -- additional information (text)
• Calcium plage data format -- print before viewing data files
• Calcium plage daily data by year
• McMath Solar Observatory
  • 1942 1943 1944 1945 1946 1947 1948 1949
  • 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959
  • 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969
  • 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979
  Hale (Mt. Wilson) Solar Observatory -- Hale format
  • 1979 1980 1981
• Big Bear Solar Observatory -- Big Bear format
  • 1981 1982 1983 1984 1985 1986 1987

• Calcium plage index -- format -- print before viewing data
  • 1942 1943 1944 1945 1946 1947 1948 1949
  • 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959
  • 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969
  • 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979
  • 1980 1981 1982 1983 1984 1985 1986 1987

• Paper -- A 10-Year Set of CaII K-line Filtergrams
• Report -- Analysis of a 10-Year Set of CaII K-line Filtergrams
• Report Update -- Analysis of a 10-Year Set of CaII K-line Filtergrams
• Calcium images -- access information
• Daily Index (12) -- information
  • Daily Index by year 1996 1997

• Short descriptive text
• Daily index in year files
  • 1976 1977 1978 1979
  • 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989
  • 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
  • 2000 2001 2002
  • One file, good for plotting All data

• Daily white light sunspot regions are tied to the overlying Ca K plage regions each day.
  • SGD table format -- print before viewing data
  • Table listings in yearly files
    • 1969
    • 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979
    • 1980 1981 1982