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100 | 1 | _ | |a Sterpka, C. |0 0000-0001-8217-0836 |b 0 |e Corresponding author |
245 | _ | _ | |a The Spontaneous Nature of Lightning Initiation Revealed |
260 | _ | _ | |a Hoboken, NJ |c 2021 |b Wiley |
336 | 7 | _ | |a article |2 DRIVER |
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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. |0 0000-0002-3581-1503 |b 1 |
700 | 1 | _ | |a Liu, N. |b 2 |
700 | 1 | _ | |a Hare, B. M. |0 0000-0001-5138-1235 |b 3 |
700 | 1 | _ | |a Scholten, O. |b 4 |
700 | 1 | _ | |a Buitink, S. |b 5 |
700 | 1 | _ | |a Veen, S. ter |b 6 |
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773 | _ | _ | |a 10.1029/2021GL095511 |g Vol. 48, no. 23 |0 PERI:(DE-600)2021599-X |n 23 |p GL095511 |t Geophysical research letters |v 48 |y 2021 |x 0094-8276 |
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