On the Causative Strokes of Halos Observed by ISUAL in the Vicinity of North America

Gaopeng Lu, Bingkun Yu, Steven A. Cummer, Kang Ming Peng, Alfred B. Chen, Fanchao Lyu, Xianghui Xue, Fei Liu, Rue Ron Hsu, Han Tzong Su

研究成果: Article同行評審

12 引文 斯高帕斯(Scopus)

摘要

The analysis of impulse charge moment change (iCMC) for the parent lightning strokes of 497 halos observed by the Imager of Sprites and Upper Atmospheric Lightning near North America in 2004–2015 indicates that the majority were produced by negative cloud-to-ground strokes predominantly produced in oceanic and coastal thunderstorms. Positive halos are almost always accompanied by sprites, and negative sprites are usually associated with halos. There are limited observations of positive pure halos with supercritical iCMCs (> +320 C km), but there are many negative pure halos with supercritical iCMCs (> −500 C km), suggesting a critical role of impulse charge transfer duration in the formation of streamers. The halo-producing threshold of lightning strength does not considerably depend on the polarity. Due to the dependence on the timescale of impulse charge transfer for streamer development, many negative cloud-to-ground strokes with iCMCs exceeding the threshold for sprite production actually produce halos instead.

原文English
頁(從 - 到)10,781-10,789
期刊Geophysical Research Letters
45
發行號19
DOIs
出版狀態Published - 2018 10月 16

All Science Journal Classification (ASJC) codes

  • 地球物理
  • 地球與行星科學(全部)

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