`::I think the best answer is... a lightning discharge is more in tune with AC... based on 3 simple facts;   ::* 1) All lightning protection systems utilize multi-stranded conductors, not solid wires.... reason being skin effect, AC current flows on the surface not through the core of the conductor as does DC.  Woven stranded ``lightning wire`` maximizes surface area, not volume.  ::* 2) Impedance is a main concern in providing effective Surge Protection Devices, not resistance.  Impedance is a factor of AC, resistance that of DC.  ::* 3) Charge moves in both direction through the flash channel during discharge, and most lightning events are categorized as having more than 3 return strokes, noted by the strobe light appearance of a typical lightning event.  ::     `