Geomagnetic data
Yokohama graph (minutely data)
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Available
01/2001 ～ 07/2021
Definitive data
01/2001 ～ 07/2021
Provisional data
08/2021 ～ 07/2021
Geomagnetic data
MT data
Geomagnetic charts
Aeromagnetic data
Report of geomagnetic survey