气候变化领域集成服务门户(CCPortal): Optical Spectra of Small-Scale Sprite Features Observed at 10,000 fps

CCPortal

DOI	10.1029/2020JD033170
	Optical Spectra of Small-Scale Sprite Features Observed at 10,000 fps
	Stenbaek-Nielsen H.C.; McHarg M.G.; Haaland R.; Luque A.
发表日期	2020
ISSN	2169897X
卷号	125 期号:20
英文摘要	Spectra of small-scale sprite structures, downward and upward propagating streamers, glow, and beads, were recorded with a slitless spectrograph at 10,000 frames per second (fps) from aircraft missions in 2009 and 2013. The spectra are dominated by emissions from molecular nitrogen, the first positive band in the red, and in the blue the second positive band plus the first negative band of molecular nitrogen ions. The excitation threshold for the blue emissions is higher than for the red emissions, so the blue/red ratio can, in principle, be used as a proxy for the electron energy leading to the emissions. We extracted for analysis time series of spectra from 11 sprites: 18 time series from downward propagating streamers, 6 from upward propagating streamers, 14 from glow, and 12 from beads. The total number of spectra in the 50 time series is 953. Blue emissions are almost exclusively associated with streamers indicating the more energetic nature of streamers compared with glow and beads. Both downward and upward propagating streamers start and end with low blue emissions indicating time variations in the associated processes. Because the red and blue nitrogen emissions are significantly affected by quenching, which is altitude dependent, and we do not have sufficiently accurate altitudes, the observed spectral blue/red ratios cannot be directly applied to sprite models. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	sprite; sprite spectra; TLE
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185690
作者单位	Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; Space Physics and Atmospheric Research Center, U.S. Air Force Academy, Colorado Springs, CO, United States; Arts and Sciences, Augsburg University, Minneapolis, MN, United States; Instituto de Astrofísica de Andalucía (IAA), CSIC, Granada, Spain
推荐引用方式 GB/T 7714	Stenbaek-Nielsen H.C.,McHarg M.G.,Haaland R.,et al. Optical Spectra of Small-Scale Sprite Features Observed at 10,000 fps[J],2020,125(20).
APA	Stenbaek-Nielsen H.C.,McHarg M.G.,Haaland R.,&Luque A..(2020).Optical Spectra of Small-Scale Sprite Features Observed at 10,000 fps.Journal of Geophysical Research: Atmospheres,125(20).
MLA	Stenbaek-Nielsen H.C.,et al."Optical Spectra of Small-Scale Sprite Features Observed at 10,000 fps".Journal of Geophysical Research: Atmospheres 125.20(2020).