TAKAGI-Nobuyuki

TAKAGI Nobuyuki
Title Professor
Department Department of Electrical, Electronic and Computer Engineering
Course Electrical and Electronic Course

Research fields

In Japanese winter thunderstorms, many cloud-to-ground lightning discharges are characterized as upward lightning. These upward lightning discharges have caused a lot of damage to high objects, such as large-scale windmills. Many upward lightning that occurr during Japanese winter thunderstorms involve more than one grounded structure. If the grounded structures happen to be power-transmission towers, in many cases this type of upward lightning will cause power outages. To reduce lightning-caused outages, there is a need to understand the mechanism of multiple upward lightning flashes. During the winters from 2000, we have recorded the electric current, electric field change and high-speed video image of lightning which hit on a windmill or/and its lightning protection tower. This windmill and its lightning protection tower are located at Uchinada-chou, Ishikawa prefecture of Japan, with their heights being 100 m and 105 m, respectively. As is generally known, an upward lightning is characterized by an upward leader that is initiated from a high-grounded object and that propagates toward overhead charged clouds. An interesting question about upward lightning is how its upward leader is initiated. The following are other our recent research topics.
*Development of a system for remotely measuring the distribution of air space charge in real time
*Lightning forecast

High-speed image of two associated upward lightning flashes

Lightning observatory at Uchinada

Research Keywords

　Lightning, Wind power generation, Space charge, Lightning forecast

Details page