White-Light Full-Disk Image (Photographs)

Digitized photographs of the white-light observed from 1918 to 1998. Details of the observation are shown below. Here we provide jpeg image calendars, direct links to jpeg image directories, and direct links to FITS file directories. Since 1998, images are observed by CCD camera on the 10cm sunspot telescope (specification is here).

  • Period: 1918-1998
  • Instrumentation:
    • Steinheil 10.5cm equatorial telescope (1918-1921)
    • Grubb 30cm siderostat (1921-1923)
    • 4.5cm objective lens (1923-1939, installed on the Steinheil 10.5cm equatorial telescope)
    • Steinheil 10.5cm telescope (1939-1998, installed on the Carl Zeiss 20cm equatorial telescope)
  • Recoding device:
    • Photographic plate, quarter-plate (1918-1923,1926-1930,1938-1943,1946)
    • Photographic plate, cabinet card (1923-1937,1956-1968)
    • 120x165mm sheet film (1968-1998)
  • Telescope site: Azabu (1918-1924) and Mitaka (1925-1998), Tokyo, Japan
  • Number of images: 19242
  • Number of observing days: 11680

Direct Links to jpg file directories (800x800 pixels)

1990 1991 1992 1993 1994 1995 1996 1997 1998
1980 1981 1982 1983 1984 1985 1986 1987 1988 1989
1970 1971 1972 1973 1974 1975 1976 1977 1978 1979
1960 1961 1962 1963 1964 1965 1966 1967 1968 1969
1950 1951 1952 1953 1954 1955 1956 1957 1958 1959
1940 1941 1942 1943 1944 1945 1946 1947 1948 1949
1930 1931 1932 1933 1934 1935 1936 1937 1938 1939
1920 1921 1922 1923 1924 1925 1926 1927 1928 1929
1918 1919
The celestial north is roughly to the top, and the west is roughly to the right.
A filename, "wlYYYYMMDD_nnn.jpg", shows the date with YYYYMMDD and the daily image number with nnn.

Direct Links to FITS file directories

1990 1991 1992 1993 1994 1995 1996 1997 1998
1980 1981 1982 1983 1984 1985 1986 1987 1988 1989
1970 1971 1972 1973 1974 1975 1976 1977 1978 1979
1960 1961 1962 1963 1964 1965 1966 1967 1968 1969
1950 1951 1952 1953 1954 1955 1956 1957 1958 1959
1940 1941 1942 1943 1944 1945 1946 1947 1948 1949
1930 1931 1932 1933 1934 1935 1936 1937 1938 1939
1920 1921 1922 1923 1924 1925 1926 1927 1928 1929
1918 1919
These FITS files contain raw scanned data. The header of each file includes various kinds of information as follows.
  • CRPIXn : approximate position of the disk center
  • CROTA1 : position angle of the celestial north from the top of image
  • CDELT1 : positive (1) is to the west, negative (-1) to the east
  • CDELT2 : positive (1) is to the north, negative (-1) to the south
  • SOLR_PIX : approximate radius of the disk in pixel

Calendars and javascript movies of jpg files (800x800 pixels)

The celestial north is roughly to the top, and the west is roughly to the right.
A filename, "wlYYYYMMDD_nnn.jpg", shows the date with YYYYMMDD and the daily image number with nnn.
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