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

Ivana Kolmasova, `Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic; Department of Upper Atmosphere, Institute of Atmospheric Physics CAS, Prague, Czech Republic, Ondrej Santolik, Institute of Atmospheric Physics ACSR, Praha 4, Czech Republic, Thomas Farges, CEA Commissariat à l'Energie Atomique DAM, Arpajon Cedex, France, Steven A Cummer, Duke University, Department of Electrical and Computer Engineering, Durham, United States, Radek Lan, Institute of Atmospheric Physics, Czech Academy of Sciences, Prague, Czech Republic and Ludek Uhlir, Institute of Atmospheric Physics of the Czech Academy of Sciences, Department of Space Physics, Prague, Czech Republic