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Table 1 Largest magnetic storm events of − dH > 400 nT at KAK since May 1924

From: Extreme geomagnetic activities: a statistical study

Year Month Day −dH (nT) Notes (reference, etc.)
1928 7 7 486  
1938 1 22 490  
1938 4 16 509  
1940 3 24 661  
1941 9 18 604  
1946 7 26 462  
1949 1 24 407  
1957 9 13 486  
1958 2 11 617 Kataoka et al. (2019)
1958 7 8 472  
1959 7 15 533  
1960 11 12 417  
1967 5 25 509  
1982 7 13 630  
1989 3 13 644 Nagatsuma et al. (2015)
1991 3 24 503  
1992 5 9 426  
2001 3 31 477  
2003 10 29 423  
2003 11 20 415  
2004 11 7 460  
2005 5 15 401