Publications [#328875] of Steven A. Cummer

Papers Published

1. Lu, G; Cummer, SA; Chen, AB; Lyu, F; Li, D; Liu, F; Hsu, RR; Su, HT, Analysis of lightning strokes associated with sprites observed by ISUAL in the vicinity of North America, Terrestrial, Atmospheric and Oceanic Sciences, vol. 28 no. 4 (August, 2017), pp. 583-595, Chinese Geoscience Union [doi]
   (last updated on 2023/06/01)

   Abstract:
   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.