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Characteristics of Negative Cloud-To-Ground Flashes Observed in the Brazilian Amazon Region
Journal of Geophysical Research: Atmospheres ( IF 4.4 ) Pub Date : 2021-07-16 , DOI: 10.1029/2020jd034492
Adonis F. R. Leal 1, 2 , Wendler L. N. Matos 1, 2 , Eduardo R. Ferreira 1, 2 , Gabriel A. V. S. Ferreira 1, 2 , Marcio N. G. Lopes 3 , Brigida Rocha 2
Affiliation  

Features of negative cloud-to-ground (CG) flashes in the eastern Amazon region of Brazil, near the equator line, were analyzed from their wideband (160 Hz–10 MHz) electric field records acquired at the UFPA-Lightning Research Laboratory in Belem, Para, Brazil in the rainy season of 2020. Records of CG flashes were synchronized in time with the Geostationary Lightning Mapper (GLM) data. We found that the GLM relative detection efficiency for negative CG flashes in the region of study is 78.5%. For a subset of 613 flashes that were detected by the GLM, we segregate the events into three categories (close-, intermediate- and distant-range) according to the GLM reported locations. Flash multiplicity, interstroke time interval, flash duration, leader duration, preliminary-breakdown (PB) pulse train duration, PB to first return-stroke (RS) time interval, and the ratio of PB to first RS are determined for 781 negative CG flashes containing 2,383 strokes. The results were compared with previous results obtained in different parts of the globe with an emphasis on studies performed in similar regions such as in the tropics. For all flashes, the average number of strokes per flash is 3.1 and the percentage of single-stroke flash is 30%. The geometric mean of interstroke intervals, flash duration, PB to first RS time interval, and PB pulse train duration are 63, 186, 10, and 1.5 ms, respectively.

中文翻译:

在巴西亚马逊地区观测到的负云地闪特征

从位于贝伦的 UFPA 闪电研究实验室获得的宽带 (160 Hz–10 MHz) 电场记录分析了巴西东部亚马逊地区靠近赤道线的负云对地 (CG) 闪光特征2020 年雨季的巴西帕拉。 CG 闪光记录与地球同步闪电测绘仪 (GLM) 数据及时同步。我们发现研究区域内负 CG 闪光的 GLM 相对检测效率为 78.5%。对于 GLM 检测到的 613 次闪光的子集,我们根据 GLM 报告的位置将事件分为三类(近距离、中距离和远距离)。闪光多重性、击穿时间间隔、闪光持续时间、先导持续时间、初步击穿 (PB) 脉冲序列持续时间、PB 到第一次回击 (RS) 时间间隔、PB 与第一个 RS 的比率是针对 781 次负 CG 闪光确定的,其中包含 2,383 个笔画。将结果与之前在全球不同地区获得的结果进行了比较,重点是在热带等类似地区进行的研究。对于所有闪光,每次闪光的平均笔画数为 3.1,单笔闪光的百分比为 30%。冲程间隔、闪光持续时间、PB 到第一个 RS 时间间隔和 PB 脉冲序列持续时间的几何平均值分别为 63、186、10 和 1.5 ms。平均每次闪光次数为3.1次,单次闪光比例为30%。冲程间隔、闪光持续时间、PB 到第一个 RS 时间间隔和 PB 脉冲序列持续时间的几何平均值分别为 63、186、10 和 1.5 ms。平均每次闪光次数为3.1次,单次闪光比例为30%。冲程间隔、闪光持续时间、PB 到第一个 RS 时间间隔和 PB 脉冲序列持续时间的几何平均值分别为 63、186、10 和 1.5 ms。
更新日期:2021-08-24
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