Positive recoil leader in rocket-triggered and tower-initiated lightning flashes as observed by high speed video camera

Xiushu Qie1, Yunjiao Pu2, Rubin Jiang2, Mingyuan Liu2 and Zhuling Sun2, (1)Insititute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China, (2)Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China