Please use this identifier to cite or link to this item: https://dspace.ctu.edu.vn/jspui/handle/123456789/39496
Title: Generation of Seed Electrons by Extensive Air Showers, and the Lightning Inception Problem Including Narrow Bipolar Events
Authors: Rutjes, Casper
Ebert, Ute
Buitink, Stijn
Scholten, Olaf
Trinh, Thi Ngoc Gia
Keywords: Lightning
Hydrometeors
Lightning inception
Thundercloud
Electron seed
Issue Date: 2019
Series/Report no.: Journal of Geophysical Research: Atmospheres;Vol. 124 No. 13 .- P.7255-7269
Abstract: Lightning streamers and leaders need thermal electrons to initiate, but free electrons are extremely rare in the wet air of a thundercloud. Here we analyze the probabilities that high electron densities occur in extensive air showers. We argue that relevant air showers are created by cosmic particles with energies between 10¹⁵ and 10¹⁷ eV impinging onto our atmosphere. We simulate a large number of air showers and perform a stochastic analysis of their results. We present the available densities of thermal electrons as a function of altitude, time interval, and considered area, while neglecting effects of local electric fields. We find that free electron densities at altitudes between 5 and 13 km can reach values of order 103 cmˉ³, but only in shower cores with a radius on a centimeter scale. Above 6 km, the availability of extreme free electron densities decreases significantly with increasing altitude. Recent measurements by Rison et al. (2016, https://doi.org/10.1038/ncomms10721) indicate that several streamers must have been triggered simultaneously during discharge inception, and we suggest that an extensive air shower could have been the trigger. Rison's measurements show further that the streamers are laterally separated by several tens of meters, so they must have been triggered by electron densities as low as 1 cmˉ³. Such low electron densities demand a stochastic approach to streamer initiation near hydrometeors.
URI: https://dspace.ctu.edu.vn/jspui/handle/123456789/39496
Appears in Collections:Tạp chí quốc tế

Files in This Item:
File Description SizeFormat 
_file_2.98 MBAdobe PDFView/Open
Your IP: 18.119.157.241


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.