Sub-ionospheric Propagation of Preliminary Breakdown Pulses Preceding Negative Cloud-to Ground Lightning Discharges

Ivana Kolmasova1,2, Ondrej Santolik3, Thomas Farges4, Steven A Cummer5, Radek Lan6 and Ludek Uhlir6, (1)`Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic, (2)Department of Upper Atmosphere, Institute of Atmospheric Physics CAS, Prague, Czech Republic, (3)Institute of Atmospheric Physics ACSR, Praha 4, Czech Republic, (4)CEA Commissariat à l'Energie Atomique DAM, Arpajon Cedex, France, (5)Electrical and Computer Engineering Department, Duke University, Durham, NC, USA, Electrical and Computer Engineering, Durham, United States, (6)Institute of Atmospheric Physics of the Czech Academy of Sciences, Department of Space Physics, Prague, Czech Republic