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Evolution of Discharge Characteristics Along the Positive Cloud‐To‐Ground Lightning Channel
Author(s) -
An Tingting,
Yuan Ping,
Chen Rongrong,
Zhang Nan,
Wan Ruibin,
Zhang Meng,
Liu Guorong
Publication year - 2021
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1029/2020jd033478
Subject(s) - lightning (connector) , current (fluid) , intensity (physics) , attenuation , channel (broadcasting) , spectrograph , spectral line , electric field , meteorology , physics , environmental science , optics , electrical engineering , engineering , power (physics) , quantum mechanics , astronomy , thermodynamics
Two positive cloud‐to‐ground lightning spectra have been captured by a slit‐less spectrograph. In combination with the synchronous electric field change waveshape, the discharge characteristics along the channel have been investigated. The results show that the total intensity of ionic lines in spectra and the electrical conductivity increase with the increase of channel height. According to the positive correlation between the total intensity of ionic lines and the discharge current, it is found that the current intensity of downward positive cloud‐to‐ground lightning increases with the increase of channel height. Comparing it with the reported current attenuation along the channel of downward negative lightning, it is deduced that the increasing or decreasing of the current along the discharge channel is likely to be related to the current direction.