Why does negative CG lightning have subsequent return strokes?

Robert A Wilkes1, Daniel Abrahm Kotovsky1, Martin A Uman2, Felipe Lenz Carvalho1 and Douglas Jordan3, (1)University of Florida, Ft Walton Beach, FL, United States, (2)University of Florida, Gainesville, FL, United States, (3)Univ Florida, Gainesville, FL, United States
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