@article{oai:nagoya.repo.nii.ac.jp:00019588, author = {石川, 晴治 and 高木, 増美 and ISIKAWA, Haruji and TAKAGI, Masumi}, issue = {1}, journal = {空電研究所報告}, month = {Sep}, note = {In the previous paper the authors classified the atmospherics waveforms from near origins into three fundamental types, i.e. main discharge type, leader discharge type and partial discharge type. It has been studied further in the present paper,the fine structure of the leader discharge type waveforms from the cumulo-nimbus which has grown up to a stage just before a thunder-cloud, the waveforms from cloud to earth lightning discharges, and the main discharge type waveforms in calm days. Breadths of pulses of differential type waveform and their intervals, which form the leader discharge type waveforms,are found to have their most frequent values of about 60 micro-seconds and 350 micro-seconds respectively. A statistical study of these waveforms shows that the leader like type waveform from cumulo-nimbus corresponds unlikely to the stepped leader strokes as in the case of the cloud to earth discharges, but represents presumably the small local separate dart leader like discharges occurring in succession as well as the small multiple dart leader like discharges in the clouds. The simultaneous observation of lightning flash and corresponding discharge waveform shows that the first pulse of the main discharge type waveform of cloud to earth discharge should be interpreted as to be emitted from the return stroke of the corresponding cloud to earth lightning flash. The comparison between the waveforms of the main discharge type in calm days and those obtained during thunder-storms,which correspond perhaps both to cloud to earth discharges and to cloud discharges of special types,indicates that the main discharge type waveform in calm days does not always interpreted as to be emitted from the return stroke of a cloud to earth lightning discharge,but also may be interpreted as to be radiated from a special type discharge in the cloud.}, pages = {13--20}, title = {近距離空電波形の研究(第3報) : 波形の微細構造}, volume = {4}, year = {1953} }