中緯度で観測された太陽活動極大期の磁気嵐

概要

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A large magnetic storm occurred on l5 July 2000. This magnetic storm was one of the biggest storms in this solar cycle. The Department of Aeronautics and Astronautics, School of Engineering Tokai University has installed two types of magnetometer, i.e. a fluxgate magnetometer and a proton magnetometer at the Tokai University Space Information Center located at Kumamoto (Geomagnetic latitude = 22.5゜N, Geomagnetic longitude = 199.7゜E) in May 1996. The magnetometers recorded the large magnetic storm which might be caused by a high stream solar wind associated with a coronal mass ejection (CME) from a strong X-ray flare occurred at l0 : 03 UT on 14 July 2000. The distinctive feature of this magnetic storm observed at Kumamoto is as follows; a large amplitude storm sudden commencement (SC) was observed, although Kumamoto was located at the midnight in the local time at this moment. The amplitude of the SC was about 140 nT. It accompanied a big storm main phase having a maximal decrease of the H component magnetic field about -250 nT. The large amplitude Pc 5 magnetic pulsations were observed during the recovery phase of the magnetic storm.
東海大学の論文