@article{oai:nagoya.repo.nii.ac.jp:00019684, author = {岩井, 章 and 伊藤, 吉之助 and IWAI, Akira and ITO, Kichinosuke}, issue = {1-2}, journal = {空電研究所報告}, month = {Apr}, note = {This paper gives the typical example obtained for two years by the apparatus counting automatically local lightning flashes within 20 km. In conclusion, the experiments suggested that the apparatus which has wide band frequency characteristics in the V. L. F. range and a threshold value of 1 v/m in field intensity could be recommended as the local lightning flash counter, as proposed by C.C.I.R. and U.R.S.I.}, pages = {39--43}, title = {雷放電計数器による雷観測について}, volume = {6}, year = {1956} }