@article{oai:nagoya.repo.nii.ac.jp:00019817, author = {KAMADA, Tetsuo}, journal = {Proceedings of the Research Institute of Atmospherics, Nagoya University}, month = {Mar}, note = {Sudden abnormal changes of VLF atmospherics intensities, caused by the very high altitude nuclear explosion over Johnston Island on July 9th 1962, were observed at Toyokawa, Japan. The aspect of this anomalies on records was just the same as SEA caused by solar flares. On the occasion, as the sun was quiet and the onset of the anomalies coincided with the explosion, it seems to me that the anomalies were caused by bomb-induced ionization in the ionospheric D layer. So, it was named "the SEA effect due to nuclear explosion". In this paper are reported the observation results and a comment on the order of disturbances in the ionospheric D layer.}, pages = {19--25}, title = {SEA EFFECT DUE TO THE HIGH ALTITUDE NUCLEAR EXPLOSION}, volume = {12}, year = {1965} }