Unlike the laws of the propagation of the field, why the shape of Electromagnetic field radiated by lightning increases and take an ascending form far distance?
Ground is not perfectly conducting, thus the image dipoles appear retarded, hence altering the wave shape.
Dear Djalel Dib, I suggest you read my publication of the IEEE-EMC. The paper shows analyzes that can answer your question and help you in your researches. Sincerely. https://www.researchgate.net/publication/264387155_On_the_Influence_of_Stroke_Current_Propagation_Velocity_on_Lightning_Horizontal_Electric_Fields?ev=prf_pub
Article On the Influence of Stroke Current Propagation Velocity on L...
Feynman provided a very interesting explanation of the ligthning phenomenon creation in his EM courses. See the link below.
http://www.feynmanlectures.caltech.edu/II_09.html#Ch9-S4
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