Electric Currents as a Probable Cause of Daily Magnetic Variation
地磁氣日變化の原因と見做さるゝ電流に就いて

K. Terada
1942 Journal of the Meteorological Society of Japan  
doi:10.2151/jmsj1923.20.10_353 fatcat:7p5i2lhoknfg7fzdzyk6kfxn5u