Geomagnetic data
Otaki graph (minutely data)
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Available
01/2001 ～ 12/2015
Definitive data
01/2001 ～ 04/2013
Provisional data
05/2013 ～ 12/2015
Geomagnetic data
MT data
Geomagnetic charts
Aeromagnetic data
Report of geomagnetic survey