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Observatory List and IAGA Code
Observatories
IAGA Code
Data Resolution
Data available at WDC MUMBAI
Abinger
ABN
HR
1926 - 1956
Year
J
F
M
A
M
J
J
A
S
O
N
D
1926
1
1
1
1
1
1
1
1
1
1
1
1
1927
1
1
1
1
1
1
1
1
1
1
1
1
1928
1
1
1
1
1
1
1
1
1
1
1
1
1929
1
1
1
1
1
1
1
1
1
1
1
1
1930
1
1
1
1
1
1
1
1
1
1
1
1
1931
1
1
1
1
1
1
1
1
1
1
1
1
1932
1
1
1
1
1
1
1
1
1
1
1
1
1933
1
1
1
1
1
1
1
1
1
1
1
1
1934
1
1
1
1
1
1
1
1
1
1
1
1
1935
1
1
1
1
1
1
1
1
1
1
1
1
1936
1
1
1
1
1
1
1
1
1
1
1
1
1937
1
1
1
1
1
1
1
1
1
1
1
1
1938
1
1
1
1
1
1
1
1
1
1
1
1
1939
1
1
1
1
1
1
1
1
1
1
1
1
1940
1
1
1
1
1
1
1
1
1
1
1
1
1941
1
1
1
1
1
1
1
1
1
1
1
1
1942
1
1
1
1
1
1
1
1
1
1
1
1
1943
1
1
1
1
1
1
1
1
1
1
1
1
1944
1
1
1
1
1
1
1
1
1
1
1
1
1945
1
1
1
1
1
1
1
1
1
1
1
1
1946
1
1
1
1
1
1
1
1
1
1
1
1
1947
1
1
1
1
1
1
1
1
1
1
1
1
1948
1
1
1
1
1
1
1
1
1
1
1
1
1949
1
1
1
1
1
1
1
1
1
1
1
1
1950
1
1
1
1
1
1
1
1
1
1
1
1
1951
1
1
1
1
1
1
1
1
1
1
1
1
1952
1
1
1
1
1
1
1
1
1
1
1
1
1953
1
1
1
1
1
1
1
1
1
1
1
1
1954
1
1
1
1
1
1
1
1
1
1
1
1
1955
1
1
1
1
1
1
1
1
1
1
1
1
1956
1
1
1
1
1
1
1
1
1
1
1
1