@article{oai:nipr.repo.nii.ac.jp:00004206,
 author = {Murata, Takeshi and Matsumoto, Hiroshi and Kojima , Hirotsugu and Iyemori, Toshihiko},
 journal = {Proceedings of the NIPR Symposium on Upper Atmosphere Physics},
 month = {Jan},
 note = {P(論文), After initial observations of Auroral Kilometric Radiation (AKR), their associations with substorms had been intensively investigated during 1970's. Herein we extend these studies and propose a new index available for substorm studies, named the AKR index. We define the AKR index by the power flux of AKR normalized to a reference distance from the Earth. The AKR index is found to show good correlations with Kp and Dst indices for weak magnetic disturbances. The AKR index tends to saturate for moderate and severe disturbance.},
 pages = {64--68},
 title = {Correlations of AKR index with Kp and Dst indices},
 volume = {10},
 year = {1997}
}