Revised version of Greenwich Photoheliographic Results (GPR) sunspot catalogue
converted to DPD format and completed with solar drawings of Ógyalla, Kalocsa and Mount Wilson observatories
published by Baranyi, T. and Ludmány, A.

The Greenwich Royal Observatory compiled the Greenwich Photoheliographic Results (GPR) sunspot catalogue between 1874 and 1976. In 1976, the Debrecen Heliophysical Observatory took over this responsibility and now the Debrecen Photoheliographic Data (DPD) covers the years after 1973. The present version of GPR is created from the electronic version of GPR for sunspot groups published at NOAA National Geophysical Data Center (NGDC) and the UK Solar System Data Centre (UKSSDC) after some data revision. The presentation of data is completed with the solar drawings of Hungarian Historical Solar Drawings (Konkoly Observatory at Ógyalla, Haynald Observatory at Kalocsa) and Mount Wilson Observatory.
For further information on "The Greenwich Photo-heliographic Results (1874 – 1976)" and its revision please visit our site here and our tables of modifications.

FTP access to the revised txt version of data can be found here.

1872 1873 1874 1875 1876 1877 1878 1879 1880
1881 1882 1883 1884 1885 1886 1887 1888 1889 1890
1891 1892 1893 1894 1895 1896 1897 1898 1899 1900
1901 1902 1903 1904 1905 1906 1907 1908 1909 1910
1911 1912 1913 1914 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 Continuation at the DPD catalogue

DATA POLICY: If this graphical presentation of data or HHSD are used in any publications, please refer to this paper:
Baranyi, T., Győri, L., Ludmány, A., On-line Tools for Solar Data Compiled at the Debrecen Observatory and their Extensions with the Greenwich Sunspot Data, Solar Physics, 291, 3081-3102, 2016, DOI: 10.1007/s11207-016-0930-1


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