التفاصيل البيبلوغرافية
| العنوان: |
First Experimental Verification of Opacity for the Lightning Near‐Infrared Spectrum. |
| المؤلفون: |
Wang, Xuejuan1,2 (AUTHOR), Wang, Haitong1 (AUTHOR), Lyu, Weitao2 (AUTHOR) wtlu@ustc.edu, Chen, Lyuwen2 (AUTHOR), Ma, Ying2 (AUTHOR), Qi, Qi2 (AUTHOR), Wu, Bin2 (AUTHOR), Xu, Weiqun2 (AUTHOR), Hua, Leyan1 (AUTHOR), Yang, Jing3 (AUTHOR), Wang, Jinhu4 (AUTHOR) |
| المصدر: |
Geophysical Research Letters. 7/16/2022, Vol. 49 Issue 13, p1-10. 10p. |
| مصطلحات موضوعية: |
*NEAR infrared radiation, *ELECTROMAGNETIC spectrum, *MOLECULAR spectra, *THUNDERSTORMS, COLD regions |
| مصطلحات جغرافية: |
GUANGZHOU (China) |
| مستخلص: |
Using the spectral data of a lightning continuing discharge process observed on the 600‐m‐high Canton Tower, experimental verification of the optical thickness of lightning neutral nitrogen (NI) and neutral oxygen (OI) radiation in the near‐infrared spectrum is presented first by comparing the measured relative intensities of two NI multiplets with theoretical values. For the first time, the spectral evolution characteristics of the tall structure lightning continuing discharge process show that visible band singly ionized lines were apparent for approximately 320–400 µs. The ionized lines with higher excitation energies and the neutral lines with lower excitation energies coexist for approximately 240–320 µs, which means that there is a hot region radiating ionized lines in a radial direction from the lightning channel, but at the same time there is also a cold region radiating neutral lines. Plain Language Summary: Spectral analysis is an ideal diagnostic technique used to study the physical properties of lightning remotely. To measure the physical parameters of a lightning discharge through spectroscopic analysis of lightning plasma, the optical thickness of the lightning channel for a particular wavelength of interest must be known. Using the emission spectra of lightning on a tall structure, the optical thickness condition of lightning neutral radiation in the near‐infrared waveband is qualitatively analyzed for the first time. The spectral evolution characteristics of tall structure lightning have also been analyzed. Key Points: The lightning channel is optically thin to infrared band neutral line radiationThe spectra of the tall structure lightning continuing discharge process were studied for the first timeThe lightning channel should contain a hot region radiating ionized lines and a cold region radiating neutral lines [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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