Characteristics of polarization of geomagnetic sudden commencements observed at Syowa Station

• Main Authors: Hiroshi Nagano, Tohru Araki, Toshihiko Iyemori, Hiroshi Fukunishi, Natsuo Sato, Masaru Ayukawa
• Format: Report
• Language: English
• Published: Department of Physics, School of Liberal Arts, Asahi University/Data Analysis Center for Geomagnetism and Spacemagnetism, Faculty of Science, Kyoto University/Data Analysis Center for Geomagnetism and Spacemagnetism, Faculty of Science, Kyoto University/National Institute of Polar Research/National Institute of Polar Research/National Institute of Polar Research 1986
• Subjects: Syowa Station; Nagata; Memoirs of National Institute of Polar Research; Polar Research
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=1993; http://id.nii.ac.jp/1291/00001993/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=1993&item_no=1&attribute_id=18&file_no=1

In order to clarify local time dependence of polarization of geomagnetic sudden commencements (SC's) at Syowa Station, digital magnetic data obtained during the interval from April 1981 to January 1983 was statistically analyzed. The polarization in the horizontal plane is clockwise in the morning side and counterclockwise in the afternoon side from a view looking down onto the earth's surface. This is consistent with the statistical results from ground-based magnetic data (C. R. WILSON and M. SUGIURA : J. Geophys. Res., 66,4097,1961; T. NAGATA et al. : JARE. Sci. Rep., Ser. A, 3,64p., 1966) and from geostationary satellite magnetic data (H. NAGANO and T. ARAKI : J. Geophys. Res., 89,11018,1984). The relationship between the SC polarization sense in the horizontal plane and the pattern of SC wave form was examined. It is found that there is a fairly good correlation between them.