Relevance of magnetic properties of soil in the magnetic observatories to geomagnetic observation

• Published in: Earth, planets, and space Vol. 65; no. 4; pp. 337 - 342
• Main Authors: Mishima, Toshiaki, Owada, Takeshi, Moriyama, Takashi, Ishida, Norihisa, Takahashi, Kosuke, Nagamachi, Shingo, Yoshitake, Yuki, Minamoto, Yasuhiro, Muromatsu, Fujio, Toyodome, Shuichi
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01.01.2013; Springer Nature B.V
• Subjects: Earth and Environmental Science; Earth Sciences; Geology; Geophysics/Geodesy; annual variation; Geomagnetic observation; rock magnetism

Annual geomagnetic variations with a maximum amplitude of 5 nT, and in phase with ground temperature variations at a depth of 1–2 m, were observed in the baseline values of fluxgate magnetometers installed at three JMA magnetic observatories. A possible origin of the annual variations is a change in...