Abstract
AbstractA bipolar cloud‐to‐ground lightning flash was observed to exhibit two types of polarity reversal associated with the first two strokes separated by a not unduly long time interval of 70 ms. The first stroke was negative and had a peak current of −101 kA. The second stroke was positive, had a peak current of 16 kA and was followed by a 122 ms long bipolar continuing current. The first two strokes, including the bipolar continuing current, occurred in the same channel to ground, whose imaged 2‐D length was 4.2 km. The occurrence of positive stroke in the negative‐stroke channel is highly unusual. The 2‐D speed versus height profiles for the negative stepped leader of the first stroke and, for the first time, for the positive leader in the previously conditioned, first‐stroke channel were examined and the average speeds were found to be 4.7 × 105 m/s and 7.2 × 105 m/s, respectively.
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