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):
- Grubb 30-cm sidelostat
- Cooke 18cm/Steinheil 13.5cm Objective lenses
- Toepfer double-prism Spectroheliograph
- 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)
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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
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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
| 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 |
