气候变化领域集成服务门户(CCPortal): Source Region and Propagation of Dayside Large-Scale Traveling Ionospheric Disturbances

CCPortal

DOI	10.1029/2020GL089451
	Source Region and Propagation of Dayside Large-Scale Traveling Ionospheric Disturbances
	Nishimura Y.; Zhang S.R.; Lyons L.R.; Deng Y.; Coster A.J.; Moen J.I.; Clausen L.B.; Bristow W.A.; Nishitani N.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:19
英文摘要	We examined the source region of dayside large-scale traveling ionospheric disturbances (LSTIDs) and their relation to cusp energy input. Aurora and total electron content (TEC) observations show that LSTIDs propagate equatorward away from the cusp and demonstrate the cusp region as the source region. Enhanced energy input to the cusp initiated by interplanetary magnetic field (IMF) southward turning triggers the LSTIDs, and each LSTID oscillation is correlated with a TEC enhancement in the dayside oval with tens of minutes periodicity. Equatorward-propagating LSTIDs are likely gravity waves caused by repetitive heating in the cusp. The cusp source can explain the high LSTID occurrence on the dayside during geomagnetically active times. Poleward-propagating ΔTEC patterns in the polar cap propagate nearly at the convection speed. While they have similar ΔTEC signatures to gravity wave-driven LSTIDs, they are suggested to be weak polar cap patches quasiperiodically drifting from the cusp into the polar cap via dayside reconnection. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Gravity waves; Ionosphere; Ionospheric electromagnetic wave propagation; Ionospheric measurement; Cusp region; Energy inputs; Interplanetary magnetic fields; Large-scale traveling ionospheric disturbances; Polar cap; Polar cap patches; Source region; Total electron content; Transport properties; electron; equatorial wave; gravity wave; heating; ionosphere; magnetic field; periodicity; wave propagation
语种	英语
来源期刊	Geophysical Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/169677
作者单位	Department of Electrical and Computer Engineering and Center for Space Physics, Boston University, Boston, MA, United States; MIT Haystack Observatory, Westford, MA, United States; Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, CA, United States; Department of Physics, University of Texas at Arlington, Arlington, TX, United States; Department of Physics, University of Oslo, Oslo, Norway; Arctic Geophysics, University Centre in Svalbard, Longyearbyen, Norway; Geophysical Institute, University of Alaska Fairbanks, Fairbanks, AK, United States; Institute for Space Earth Environmental Research, Nagoya University, Nagoya, Japan
推荐引用方式 GB/T 7714	Nishimura Y.,Zhang S.R.,Lyons L.R.,et al. Source Region and Propagation of Dayside Large-Scale Traveling Ionospheric Disturbances[J],2020,47(19).
APA	Nishimura Y..,Zhang S.R..,Lyons L.R..,Deng Y..,Coster A.J..,...&Nishitani N..(2020).Source Region and Propagation of Dayside Large-Scale Traveling Ionospheric Disturbances.Geophysical Research Letters,47(19).
MLA	Nishimura Y.,et al."Source Region and Propagation of Dayside Large-Scale Traveling Ionospheric Disturbances".Geophysical Research Letters 47.19(2020).