Calcium K-line Full-Disk Spectroheliograms

Digitized spectroheliograms of the Ca K line. Details of the observation are shown below. Here we listed jpeg image calendars, direct links to jpeg image directories, and direct links to FITS file directories.

  • Period: 1917-1974
  • Instrumentation (Photos are provided by Public Relations Center):
  • Spectral window: 0.5Å
  • Recording device:
    • Photographic plate, Atom size (1917)
    • Photographic plate, quarter-plate (1918-1930, 1933-1959)
    • 24x35mm film (1960-1974)
  • Telescope site: Azabu (1917-1924) and Mitaka (1925-1974), Tokyo, Japan
  • Number of images: 8585
  • Number of observing days: 8524

Direct Links to jpg file directories (800x800 pixels)

1970 1971 1972 1973 1974
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
1917 1918 1919
The celestial north is roughly to the top, and the west is roughly to the right.
A filename, "caYYYYMMDD_nnn.jpg", shows the date with YYYYMMDD and the daily image number with nnn.

Direct Links to FITS file directories

1970 1971 1972 1973 1974
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
1917 1918 1919
These FITS files contain raw scanned data. The header of each file includes various kinds of information as follows.
  • NEGAPOSI : positive (1) or negative (-1) image
  • CRPIXn : approximate position of the disk center
  • CROTAn : rotation angle of data axis, cw is positive
  • 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
  • SS_ANGLE : rotation angle of siderostat from celestial north, ccw is positive

Calendars and javascript movies of jpg files

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