The electric field changes and UHF radiations caused by the triggered lightning in Japan

摘要: The electric field changes, the magnetic and UHF radiation were observed during rocket-triggered lightning experiment in winter storms. A remarkable discrepancy is noticed between electromagnetic changes of flashes triggered with a rocket an isolated wire that struck power tower grounded wire. Flashes to have distinguishable first pulse large amplitude, which, we speculate, occurs at moment attachment downward leader tower. measurements indicate process starts series resembling negative stepped leader. change records rockettriggered storms do not show presence rapid variations typical for return strokes natural cloud-to-ground flashes.