Simultaneous observations of storm-generated sprite and gravity wave over Bangladesh

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Title:	Simultaneous observations of storm-generated sprite and gravity wave over Bangladesh
Authors:	郭政靈;Chou, Chien‐Chung;Dai, Jeff;Kuo, Cheng‐Ling;Huang, Tai‐Yin
Contributors:	地球科學學院太空科學與工程學系
Keywords:	Airglow;Atmospheric pressure;Convection;Data analysis;Dispersion (wave);Elevation angle;Emissions;Geophysics;Gravitational waves;Gravity;gravity wave;Gravity waves;Inertia;Lightning;Lightning activity;Low clouds;Meteorology;Phase velocity;Precursors;Ripples;Sprites;Storms;Surface temperature;Wave propagation
Date:	2016-09-01
Issue Date:	2026-04-23 11:06:00 (UTC+8)
Publisher:	Wiley-Blackwell;Washington: American Geophysical Union (AGU)
Abstract:	摘要： AbstractWe report simultaneous observations of sprite and gravity wave generated by a storm over Bangladesh. The origin of a concentric gravity wave can be traced to the storm region on 27 April 2014 over Bangladesh with a low cloud top surface temperature (175 K). After data analysis, the time period of the concentric gravity wave is found to be 8.8–8.9 min. The horizontal wavelength is found to be ~50 km for red emissions (~55 km for green emissions), and the horizontal phase velocity is 94.4 ± 31.7 m s−1 for red emissions (102.6 ± 29.4 m s−1 for green emissions). Using the dispersion relation of gravity wave, the elevation angle of wave propagation direction is found to be ~53.3°. The sprite associated with the gravity wave was also recorded at 1534 UT on 27 April 2014. The initiation time of storm‐generated gravity wave is estimated to be 1454 UT at which lightning activity was relatively low using lightning data. At time 1534 UT of the recorded sprite, the lightning rate was close to its maximum value. The storm‐generated gravity wave could be thought as a precursor phenomenon for lightning and sprites since one of the necessary conditions for gravity wave, lightning, and sprites is strong convection inside storms. 出版者： Washington: American Geophysical Union (AGU) 出版日期： 2016-09 出處： Journal of Geophysical Research: Space Physics, 2016-09, Vol.121 (9), p.9222-9233 資源來源： Wiley Journals Core Collection (NTUSG) 版權： 2016. American Geophysical Union. All Rights Reserved. 識別號： ISSN: 2169-9380 識別號： ISSN: 2169-9402 識別號： EISSN: 2169-9402 識別號： DOI: 10.1002/2016ja022554
Appears in Collections:	[DEPARTMENT OF SPACE SCIENCE AND ENGINEERING] journal & Dissertation

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