Authors
N Mashiko
Kakioka Magnetic Observatory, Japan Meteorological Agency, 595 Kakioka, Ishioka-shi, Ibaraki 315-0116, Japan
T Yamamoto
Meteorological Research Institute, Japan Meteorological Agency, 1-1 Nagamine, Tsukuba-shi, Ibaraki 305-0052, Japan
M Akutagawa
Kakioka Magnetic Observatory, Japan Meteorological Agency, 595 Kakioka, Ishioka-shi, Ibaraki 315-0116, Japan
Y Minamoto
Kakioka Magnetic Observatory, Japan Meteorological Agency, 595 Kakioka, Ishioka-shi, Ibaraki 315-0116, Japan
