Measurement of geomagnetically induced current (GIC) around Tokyo, Japan

Earth, Planets and Space

Satoko Nakamura¹  Shinichi Watari²  Yusuke Ebihara³ 

[1] Institute for Space-Earth Environmental Research, Nagoya University, Furo-cho, 464-8601, Chikusa-ku, Nagoya, Japan;National Institute of Information and Communications Technology, 4-2-1, Nukui-Kitamachi, 184-8795, Koganei, Tokyo, Japan;Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, 611-0011, Uji City, Kyoto, Japan;

关键词: Geomagnetically induced current (GIC);    Equipment;    Storm sudden commencement (SSC);    Sudden impulse (SI);    Geomagnetic storm;    Bay disturbance;    Solar flare effect (SFE);    Magnetic cloud;    Space weather;   

DOI  :  10.1186/s40623-021-01422-3

来源: Springer

【 摘 要 】

We need a typical method of directly measuring geomagnetically induced current (GIC) to compare data for estimating a potential risk of power grids caused by GIC. Here, we overview GIC measurement systems that have appeared in published papers, note necessary requirements, report on our equipment, and show several examples of our measurements in substations around Tokyo, Japan. Although they are located at middle latitudes, GICs associated with various geomagnetic disturbances are observed, such as storm sudden commencements (SSCs) or sudden impulses (SIs) caused by interplanetary shocks, geomagnetic storms including a storm caused by abrupt southward turning of strong interplanetary magnetic field (IMF) associated with a magnetic cloud, bay disturbances caused by high-latitude aurora activities, and geomagnetic variation caused by a solar flare called the solar flare effect (SFE). All these results suggest that GIC at middle latitudes is sensitive to the magnetospheric current (the magnetopause current, the ring current, and the field-aligned current) and also the ionospheric current.

【 授权许可】

CC BY