Authors
Shingo Nagamachi
Kakioka Magnetic Observatory, Japan Meteorological Agency, Kakioka 595 Ishioka-shi, Ibaraki, 315-0116, Japan
Kenji Morinaga
Kakioka Magnetic Observatory, Japan Meteorological Agency, Kakioka 595 Ishioka-shi, Ibaraki, 315-0116, Japan
Yoshitomo Ikoma
Japan Meteorological Agency, 1-3-4 Otemachi, Chiyoda-ku, Tokyo, 110-8122, Japan
Mayumi Akutagawa
Kakioka Magnetic Observatory, Japan Meteorological Agency, Kakioka 595 Ishioka-shi, Ibaraki, 315-0116, Japan
Takashi Moriyama
Kakioka Magnetic Observatory, Japan Meteorological Agency, Kakioka 595 Ishioka-shi, Ibaraki, 315-0116, Japan
Takeshi Oowada
Kakioka Magnetic Observatory, Japan Meteorological Agency, Kakioka 595 Ishioka-shi, Ibaraki, 315-0116, Japan
Tetsuo Tokumoto
Kakioka Magnetic Observatory, Japan Meteorological Agency, Kakioka 595 Ishioka-shi, Ibaraki, 315-0116, Japan
