“…As a result of research programs carried out in the last twenty years, a number of commercial lightning monitoring systems were developed to provide the discharges coordinates and maximum currents [ Richard and Auffray , 1985; Rodger et al , 2006; Mäkelä et al , 2008; Betz et al , 2009]. The studies in the ELF range have a similar direction [ Cummer and Inan , 2000; Hu et al , 2002; Huang et al , 1999; Cummer and Lyons , 2004; Kułak et al , 2010; Gołkowski et al , 2011; Nieckarz et al , 2011].…”