Temporal and radiometric statistics on lightning flashes observed from space with the ISUAL spectrophotometer

NCUIR > College of Earth Sciences > DEPARTMENT OF SPACE SCIENCE AND ENGINEERING > journal & Dissertation > Item 987654321/102330

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Title:	Temporal and radiometric statistics on lightning flashes observed from space with the ISUAL spectrophotometer
Authors:	郭政靈;Offroy, Marc;Farges, Thomas;Kuo, Cheng Ling;Chen, Alfred Bing-Chih;Hsu, Rue-Ron;Su, Han-Tzong;Takahashi, Yukihiro;Mende, Stephen B.;Frey, Harald U.
Contributors:	地球科學學院太空科學與工程學系
Keywords:	Atmospheric correction;Atmospheric effects;Band spectra;Brightness;Channels;Domains;FUV;Geophysics;ISUAL;Lightning;Lightning flashes;Median (statistics);Meteorology;Near infrared radiation;NIR;Satellites;Spectrophotometers;Sprites;Statistical analysis;Statistical methods;Statistics;Temporal logic;Transient luminous events;Waveforms;Width
Date:	2015-01-01
Issue Date:	2026-04-23 11:06:25 (UTC+8)
Publisher:	Wiley-Blackwell;Washington: Blackwell Publishing Ltd
Abstract:	摘要： The Imager of Sprites and Upper Atmospheric Lightning (ISUAL) on the FORMOSAT‐2 satellite was launched in 2004 and records transient luminous events (TLEs). ISUAL is an instrument composed of an imager and a multichannel spectrophotometer which is able to measure the brightness from far ultraviolet to near infrared for TLEs and lightning flashes. Several types of TLEs have been identified, classified, and documented between 2004 and 2014. However, no statistical analyses on lightning have already been realized. In this paper, we focus on lightning flashes which did not induce TLEs. Statistics about brightness or temporal dynamic are presented from fitted waveforms from far ultraviolet to near infrared, after having corrected for atmospheric effects for each spectrophotometer channels. We demonstrate that the lightning/satellite distance and the altitude of the lightning need to be taken into account. The lightning waveforms from each spectrophotometer channel could be modeled as an exponential pulsed function which the shape could be explained by the photon propagation in the cloud. The median values at 777.4 nm are 1.63 × 10−6 W m−2 for the maximum brightness, 5.85 × 104 J for the total energy at the source, 414 µs for the full width half maximum, 620 µs for the full width at quarter of maximum, and 170 µs for the risetime. Results are compared with previous experiments performed from visible to near‐infrared domains. The median temporal variables for near‐infrared waveforms are shorter than the values of the UV waveforms. Key Points First spaceborne spectral observations of lightning flashes from UV to NIR bands NIR band brightness is more intense than UV band ones NIR waveform temporal characteristics are shorter than UV band ones 其他題名： J. Geophys. Res. Atmos 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2015-08-16 出處： Journal of geophysical research. Atmospheres, 2015-08, Vol.120 (15), p.7586-7598 資源來源： Wiley Online Library - AutoHoldings Journals 版權： 2015. American Geophysical Union. All Rights Reserved. 版權： Copyright Blackwell Publishing Ltd. Aug 2015 識別號： ISSN: 2169-897X 識別號： EISSN: 2169-8996 識別號： DOI: 10.1002/2015JD023263
Appears in Collections:	[DEPARTMENT OF SPACE SCIENCE AND ENGINEERING] journal & Dissertation

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