A Positive Leader Intermittently Extending via Bidirectional Transients and Producing a Negative Cloud-to-ground Lightning Flash

Ziqin Ding1, Vladimir A Rakov2, Yanan Zhu3, Istvan Kereszy4, Manh D Tran2 and Si Chen1, (1)University of Florida, Electrical and Computer Engineering, Ft Walton Beach, FL, United States, (2)University of Florida, Electrical and Computer Engineering, Gainesville, FL, United States, (3)University of Alabama in Huntsville, Huntsville, United States, (4)University of Florida, Department of Physics, Gainesville, FL, United States