講演情報
[PEM06-18]ICSWSE/ MAGDAS Project: 極域-磁気赤道域電磁結合系の実証的研究
*吉川 顕正1、中溝 葵2、大谷 晋一3、田中 良昌4、今城 峻5、松下 拓輝5、Cardinal Maria Gracita1、阿部 修司1、魚住 禎司1、湯元 清文1 (1.九州大学 国際宇宙天気科学・教育センター、2.フィンランド気象研究所、3.ジョンズホプキンズ'大学応用物理研究所、4.国立極地研究所、5.九州大学理学府地球惑星科学専攻)
キーワード：
宇宙天気、磁気圏電離圏結合、緯度間結合、全球結合
International Center for Space Weather Science and Education (ICSWSE) has developed a real time magnetic data acquisition system (the MAGDAS project) for space environment monitoring around the world. The number of observational sites is increasing every year with the collaboration of MAGDAS host countries. Now at this time, the MAGDAS Project has installed 73 real time magnetometers ? so it is the largest magnetometer array in the world. Applying equivalent current method to this network data, we analyze a global ionospheric current system from polar to equatorial ionosphere. Our results suggest that Dp2 type disturbances excited by solar wind variation, Pi2 type pulsations accompanied by aouroral substorm onset process and Pc3 type pulsations accompanied by dayside cavity type oscillation show the same type of global current system, which are produced by primary bipolar electric field accompanied by field-aligned current system and Hall polarization electric field excited at the dawn-dusk conductivity terminator and at the magnetic dip equator.We will discuss how the electromagnetic coupling between polar and equatorial ionosphere is regulated by the formation of global Cowling channel in the ionosphere.