Radio Emission Reveals Inner Meter-Scale Structure of Negative Lightning Leader Steps.

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ID: 101952
2020
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Abstract
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  μs). 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.
Reference Key
hare2020radiophysical Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors 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;
Journal physical review letters
Year 2020
DOI
10.1103/PhysRevLett.124.105101
URL
Keywords
Cytotoxicity hemolysis protein corona rbc thp-1 cells zn2+ zno np

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