The spectra and temperature of cloud lightning discharge channel |
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Authors: | Jie Wang Ping Yuan FengXia Guo XiuShu Qie YuHua Ouyang YiJun Zhang |
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Institution: | (1) College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou, 730070, China;(2) Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China;(3) Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China;(4) Chinese Academy of Meteorological Sciences, Beijing, 100081, China |
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Abstract: | Spectra of seven cloud lightning discharges are reported for the first time after captured with a Slit-less Spectrograph on
Chinese Tibet Plateau. The structural characters are analyzed and compared with the spectra of cloud-to-ground lightning,
and the results indicate that the spectra of cloud lightning show two different kinds of structure characteristics. One has
the similar structure as those of cloud-toground lightning discharge, and the other is absolutely different. Meanwhile, more
lines of OII with high excited energy are recorded in the spectra of cloud lightning discharge in comparison with that of
cloud-to-ground lighting happening in the same region. Temperatures at different positions are calculated and temperature
characteristics of these two sorts are analyzed, based to the wavelength, relative intensities and other transition parameters.
We suggest that the physical process in the cloud discharge channels changes with much more rapid velocity and wider range
compared to cloud-to-ground lightning. The differences between the two types of cloud discharge also reflect some discrepancies
between the discharge characteristics.
Supported by National Nature Science Foundation of China (Grant No. 40475007) and Foundation of Northwest Normal University
(Grant No. NWNU-KJCXGC-03-21) |
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Keywords: | spectra cloud lightning discharge temperature |
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