The sequence of events in a lightning stroke: terrestrial gamma ray flash, radio signal and optical lightning.

Nikolai Ostgaard1, Thomas Gjesteland2,3, Hugh J Christian Jr4, Kjetil Haakonseth Albrechtsen3, Brant Carlson5, Andrew Collier6, Steve Cummer7 and Gaopeng Lu8, (1)University of Bergen, Department of Physics and Technology, Bergen, Norway, (2)University of Agder, Grimstad, Norway, (3)University of Bergen, Birkeland Centre for Space Science, Bergen, Norway, (4)University of Alabama in Huntsville, Huntsville, AL, United States, (5)Carthage College, Kenosha, WI, United States, (6)University of KwaZulu-Natal, KwaZulu, South Africa, (7)Duke University, Electrical and Computer Engineering Department, Durham, United States, (8)School of Earth and Space Sciences, University of Science and Technology of China, Hefei, China