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The electric field changes and UHF radiations caused by the triggered lightning in Japan
Author(s) -
Kawasaki ZenIchiro,
Kanao Tadashi,
Matsuura Kenji,
Nakano Minoru,
Horii Kenji,
Nakamura KohIchi
Publication year - 1991
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/91gl02111
Subject(s) - lightning (connector) , rocket (weapon) , tower , electric field , storm , meteorology , lightning strike , thunderstorm , amplitude , electromagnetic pulse , upper atmospheric lightning , physics , geophysics , geology , aerospace engineering , power (physics) , optics , engineering , quantum mechanics , civil engineering
The electric field changes, the magnetic field changes, and UHF radiation were observed during the rocket‐triggered lightning experiment in winter storms. A remarkable discrepancy is noticed between electromagnetic field changes of flashes triggered with a rocket and an isolated wire that struck a power tower and flashes with a rocket and a grounded wire. Flashes to tower have a distinguishable first pulse of a large amplitude, which, we speculate, occurs at the moment of attachment of a downward leader to the tower. The UHF radiation measurements indicate that the triggered lightning process starts with a pulse series resembling a negative stepped leader. The electric field change records of rockettriggered lightning in winter storms do not show the presence of rapid field variations typical for return strokes in natural cloud‐to‐ground flashes.