کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5753624 1620487 2017 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The evolution of discharge current and channel radius in cloud-to-ground lightning return stroke process
ترجمه فارسی عنوان
تکامل جریان تخلیه و شعاع کانال در روند بازگشت به رعد و برق برگشت به ابر
کلمات کلیدی
کانال سکته مغزی رعد و برق جریان تخلیه، شعاع کانال، جول گرما،
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات علم هواشناسی
چکیده انگلیسی
The spectra of two negative cloud-to-ground lightning discharge processes with multi-return strokes are obtained by a slit-less high-speed spectrograph, which the temporal resolution is 110 μs. Combined with the synchronous electrical observation data and theoretical calculation, the physical characteristics during return strokes process are analysed. A positive correlation between discharge current and intensity of ionic lines in the spectra is verified, and based on this feature, the current evolution characteristics during four return strokes are investigated. The results show that the time from peak current to the half-peak value estimated by multi point-fitting is about 101 μs-139 μs. The Joule heat in per unit length of four return strokes channel is in the order of 105J/m-106 J/m. The radius of arc discharge channel is positively related to the discharge current, and the more intense the current is, the greater the radius of channel is. Furthermore, the evolution for radius of arc core channel in the process of return stroke is consistent with the change trend of discharge current after the peak value. Compared with the decay of the current, the temperature decreases more slowly.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Atmospheric Research - Volume 194, 15 September 2017, Pages 226-234
نویسندگان
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