Development of the observation network for comprehensive study on giant thunderstorm, Hector

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We have conducted field campaign in Darwin, Australia to study on giant thunderstorm, Hector by means of our original combined lightning observation network with meteorological equipments operated by Bureau of Meteorology Australia. Lightning leader channels with long horizontal developments are successfully visualized. It is concluded that the horizontal long negative leaders in cloud-to-ground flashes progress along the boundary of positive charge region. When the leaders reach the end of the positive charge regions, they change their direction to downward. An innovative estimation for charge distributions neutralized by lightning flashes is tried out. Ascent of positive charge with Hector developments is noticed.