Geomagnetic data
Akaigawa graph (minutely data)
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Available
01/2001 ～ 06/2023
Definitive data
01/2001 ～ 07/2020
Provisional data
08/2020 ～ 06/2023
Geomagnetic data
MT data
Geomagnetic charts
Aeromagnetic data
Report of geomagnetic survey