Dart leader
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A dart leader (also known as a continuous leader; may have been referred to by Feynman as a dark leader[citation needed]) is the cloud-to-ground movement of electrons which occurs just before a secondary lightning strike. The dart leader is similar to a step leader, because it is not as intense as the main strike, yet serves to ionize the air between the cloud and the ground, allowing electrical breakdown of the path of the lightning strike.
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