Characteristics of Lightning Channel in Thunderclouds Determined by Thunder

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Abstract
Lightning channels in thunderclouds are investigated with the thunder technique, and the relationship between the channel direction and the storm characteristics is discussed. It is confirmed that the channels of ground flashes horizontally extend in clouds and the channel directions tilt to the downstream of the wind in the upper atmosphere. It is found that the distribution on a horizontal plane, of the directions of horizontal channel projections inside the clouds relates with the speed of storm motion, and channel directions tend to tilt to the downstream with increasing speed of storm motion. The distribution of the channel inclinations in clouds seems to relate with the flash frequency of the storm, which is controlled by the updraft in the clouds.

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