ISUAL-Observed Blue Luminous Events: The Associated Sferics

Jung Kuang Chou, Rue-Ron Hsu, Han-Tzong Su, Bing-Chih Chen, Cheng Ling Kuo, Sung Ming Huang, Shu Chun Chang, Kang Ming Peng, Yen Jung Wu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The blue luminous events (BLEs) recorded by ISUAL (Imager of Sprites and Upper Atmospheric Lightning) radiate unambiguous middle ultraviolet to blue emissions (230–450 nm) but contain dim red emissions (623–754 nm). The BLE appears to be dot-like on one ISUAL image with an integration time of 29 ms. A few BLEs develop upward into blue jets/starters or type II gigantic jets (GJs). The associated sferics of the BLEs in the extremely low frequency to very low frequency band and in the low-frequency band exhibit similar patterns to the narrow bipolar events (NBEs) identified in the very low frequency and low-frequency band. The ISUAL BLEs are conjectured to be the accompanied light emissions of the NBEs. Both upward and downward propagating current obtained from the associated sferics of the BLEs have been found. The source heights of the six BLEs related to negative NBEs are estimated in the range of 16.2–17.8 km. These six events are suggested to occur between the upper positive charge layer and the negative screen charge layer on the top of the normally electrified thunderstorm. The six blue starters, one blue jet, and one type II GJ are inferred to be positive upward discharges from their associated sferics in the extremely low frequency to very low frequency band. Based on the simultaneous radio and optical observations, a NBE is conjectured to be the initiation discharge with rapidly flowing current within the thunderstorm, while a blue jet/starter or a type II GJ is suggested to be the ensuing discharge with slowly varying current propagating upward from the thunderstorm.

Original languageEnglish
Pages (from-to)3063-3077
Number of pages15
JournalJournal of Geophysical Research: Space Physics
Volume123
Issue number4
DOIs
Publication statusPublished - 2018 Apr 1

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lightning
sprite
Lightning
Image sensors
Atmospherics
Thunderstorms
Frequency bands
Starters
thunderstorm
starters
thunderstorms
very low frequencies
extremely low frequencies
Light emission
radio
low frequencies
radio observation
light emission

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Chou, Jung Kuang ; Hsu, Rue-Ron ; Su, Han-Tzong ; Chen, Bing-Chih ; Kuo, Cheng Ling ; Huang, Sung Ming ; Chang, Shu Chun ; Peng, Kang Ming ; Wu, Yen Jung. / ISUAL-Observed Blue Luminous Events : The Associated Sferics. In: Journal of Geophysical Research: Space Physics. 2018 ; Vol. 123, No. 4. pp. 3063-3077.
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abstract = "The blue luminous events (BLEs) recorded by ISUAL (Imager of Sprites and Upper Atmospheric Lightning) radiate unambiguous middle ultraviolet to blue emissions (230–450 nm) but contain dim red emissions (623–754 nm). The BLE appears to be dot-like on one ISUAL image with an integration time of 29 ms. A few BLEs develop upward into blue jets/starters or type II gigantic jets (GJs). The associated sferics of the BLEs in the extremely low frequency to very low frequency band and in the low-frequency band exhibit similar patterns to the narrow bipolar events (NBEs) identified in the very low frequency and low-frequency band. The ISUAL BLEs are conjectured to be the accompanied light emissions of the NBEs. Both upward and downward propagating current obtained from the associated sferics of the BLEs have been found. The source heights of the six BLEs related to negative NBEs are estimated in the range of 16.2–17.8 km. These six events are suggested to occur between the upper positive charge layer and the negative screen charge layer on the top of the normally electrified thunderstorm. The six blue starters, one blue jet, and one type II GJ are inferred to be positive upward discharges from their associated sferics in the extremely low frequency to very low frequency band. Based on the simultaneous radio and optical observations, a NBE is conjectured to be the initiation discharge with rapidly flowing current within the thunderstorm, while a blue jet/starter or a type II GJ is suggested to be the ensuing discharge with slowly varying current propagating upward from the thunderstorm.",
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ISUAL-Observed Blue Luminous Events : The Associated Sferics. / Chou, Jung Kuang; Hsu, Rue-Ron; Su, Han-Tzong; Chen, Bing-Chih; Kuo, Cheng Ling; Huang, Sung Ming; Chang, Shu Chun; Peng, Kang Ming; Wu, Yen Jung.

In: Journal of Geophysical Research: Space Physics, Vol. 123, No. 4, 01.04.2018, p. 3063-3077.

Research output: Contribution to journalArticle

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AU - Chou, Jung Kuang

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AU - Wu, Yen Jung

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