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100 1 _ |a Sterpka, C.
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245 _ _ |a The Spontaneous Nature of Lightning Initiation Revealed
260 _ _ |a Hoboken, NJ
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520 _ _ |a Here, we present new radio interferometer beamforming observations of lightning initiation using data from the Low-Frequency Array (LOFAR). We show that the first lightning source in the flash increases exponentially in intensity by two orders of magnitude in 15 μs, while propagating 88 m away from the initiation location at a constant speed of 4.8 ± 0.1 × 10$^6$ m/s. A second source replaces the first source at the initiation location, and subsequent propagation of the lightning leader follows. We interpret the first source to be a rapidly propagating and intensifying positive streamer discharge that subsequently produces a hot leader channel near the initiation point. How lightning initiates is one of the greatest unsolved problems in the atmospheric sciences, and these results shed light on this longstanding mystery.
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700 1 _ |a Dwyer, J.
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700 1 _ |a Liu, N.
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700 1 _ |a Hare, B. M.
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700 1 _ |a Scholten, O.
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700 1 _ |a Buitink, S.
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700 1 _ |a Veen, S. ter
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700 1 _ |a Nelles, A.
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773 _ _ |a 10.1029/2021GL095511
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