著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) E. W. Cliver and Y. Kamide and A. G. Ling,Mountains versus valleys: Semiannual variation of geomagnetic activity,Journal of Geophysical Research: Space Physics,0148-0227,American Geophysical Union (AGU),2000-02,105,A2,2413-2424,https://cir.nii.ac.jp/crid/1360011146586796928,https://doi.org/10.1029/1999ja900439