تقرير
Radio emission from negative lightning leader steps reveals inner meter-scale structure
| العنوان: | Radio emission from negative lightning leader steps reveals inner meter-scale structure |
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| المؤلفون: | Hare, B. M., Scholten, O., Dwyer, J., Ebert, U., Nijdam, S., Bonardi, A., Buitink, S., Corstanje, A., Falcke, H., Huege, T., Hörandel, J. R., Krampah, G. K., Mitra, P., Mulrey, K., Neijzen, B., Nelles, A., Pandya, H., Rachen, J. P., Rossetto, L., Trinh, T. N. G., ter Veen, S., Winchen, T. |
| المصدر: | Phys. Rev. Lett. 124, 105101 (2020) |
| سنة النشر: | 2020 |
| المجموعة: | Astrophysics Physics (Other) |
| مصطلحات موضوعية: | Physics - Atmospheric and Oceanic Physics, Astrophysics - Instrumentation and Methods for Astrophysics |
| الوصف: | We use the Low Frequency ARray (LOFAR) to probe the dynamics of the stepping process of negatively-charged plasma channels (negative leaders) in a lightning discharge. We observe that at each step of a leader, multiple pulses of VHF (30~--~80 MHz) radiation are emitted in short-duration bursts ($<10\ \mu$s). This is evidence for streamer formation during corona flashes that occur with each leader step, which has not been observed before in natural lightning and it could help explain X-ray emission from lightning leaders, as X-rays from laboratory leaders tend to be associated with corona flashes. Surprisingly we find that the stepping length is very similar to what was observed near the ground, however with a stepping time that is considerably larger, which as yet is not understood. These results will help to improve lightning propagation models, and eventually lightning protection models. Comment: 5 pages |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1103/PhysRevLett.124.105101 |
| URL الوصول: | http://arxiv.org/abs/2007.03231 |
| رقم الأكسشن: | edsarx.2007.03231 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1103/PhysRevLett.124.105101 |
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