Analysis of lightning strokes associated with sprites observed by ISUAL in the vicinity of North America

Gaopeng Lu, Steven A. Cummer, Alfred B. Chen, Fanchao Lyu, Dongshuai Li, Fei Liu, Rue Ron Hsu, Han Tzong Su

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8 引文 斯高帕斯(Scopus)

摘要

We examined the broadband (<1 Hz to 30 kHz) lightning sferics associated with 395 sprites observed near North America by the Imager of Sprites and Upper Atmospheric Lightning (ISUAL) onboard the FORMOSAT-2 satellite in a 12-year period from 2004 to 2015. Our analysis indicates that the ISUAL dataset contains a significant fraction (69, or ~18%) of negative sprites, which were predominantly (>80%) observed over oceanic and coastal thunderstorms mostly in tropical areas. The mean and median of impulse charge moment change (iCMC) associated with positive (negative) sprites are +346 C km (-709 C km) and +280 C km (-649 C km), respectively. The morphology and parent lightning properties (e.g., typically with high peak currents >-80 kA and large iCMCs >-300 C km) of negative sprites observed by the ISUAL are generally consistent with that documented in ground-based observations, but the ISUAL dataset does imply that sprites are sometimes produced by negative strokes with sub-critical iCMCs (less than -300 C km). Consequently, the future survey of global occurrence of sprites is desired to be based on complementary ground and space-borne observations.

原文English
期刊Terrestrial, Atmospheric and Oceanic Sciences
28
發行號4
DOIs
出版狀態Published - 2017 八月

All Science Journal Classification (ASJC) codes

  • Oceanography
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)

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