Corona surrounding the Return Stroke as a continuous cylindrical sheath, precisely in a circle, see accompanying diagram Corona Model, can have up to a certain distance from the lightning channel negative value, then back positive (simplified explanation, described in many specialized articles, such as in http://www.lightning.ece.ufl.edu/).
Sa ganitong thesis addition dalawang phenomena, ang ilang mga numero ay maaaring magpakita ng panandalian prinsipyo ng superposisyon (vector addition agarang), minsan mukhang Maging halata na walang agarang sanhi isang pagkabaligtad ng mga alon, minsan maaaring lugar pagtagos ng mga pwersa, minsan ang simple at addition pagbabawas ng mga voltages at alon (ie enerhiya pagdami o division).