气候变化领域集成服务门户(CCPortal): Quantifying the Solar Cycle Modulation of Extreme Space Weather

CCPortal

DOI	10.1029/2020GL087795
	Quantifying the Solar Cycle Modulation of Extreme Space Weather
	Chapman S.C.; McIntosh S.W.; Leamon R.J.; Watkins N.W.
发表日期	2020
ISSN	0094-8276
卷号	47 期号:11
英文摘要	By obtaining the analytic signal of daily sunspot numbers since 1818 we construct a new solar cycle phase clock that maps each of the last 18 solar cycles onto a single normalized 11 year epoch. This clock orders solar coronal activity and extremes of the aa index, which tracks geomagnetic storms at the Earth's surface over the last 14 solar cycles. We identify geomagnetically quiet intervals that are 40% of the normalized cycle, ±2π/5 in phase or ±2.2 years around solar minimum. Since 1868 only two severe (aa>300 nT) and one extreme (aa>500 nT) geomagnetic storms occurred in quiet intervals; 1–3% of severe (aa>300 nT) geomagnetic storms and 4–6% of C-, M-, and X-class solar flares occurred in quiet intervals. This provides quantitative support to planning resilience against space weather impacts since only a few percent of all severe storms occur in quiet intervals and their start and end times are quantifiable. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	C (programming language); Clocks; Geomagnetism; Solar energy; Analytic signals; Coronal activity; Earth's surface; Geomagnetic storm; Quiet interval; Severe storms; Solar cycle modulation; Sunspot number; Storms; corona; extreme event; geomagnetic storm; quantitative analysis; solar cycle; weather
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/170266
作者单位	Centre for Fusion, Space and Astrophysics, Physics Department, University of Warwick, Coventry, United Kingdom; National Center for Atmospheric Research, Boulder, CO, United States; Department of Astronomy, University of Maryland, College Park, MD, United States; NASA Goddard Space Flight Center, Greenbelt, MD 672, United States; Centre for the Analysis of Time Series, London School of Economics and Political Science, London, United Kingdom; Faculty of Science, Technology, Engineering and Mathematics, The Open University, Milton Keynes, United Kingdom
推荐引用方式 GB/T 7714	Chapman S.C.,McIntosh S.W.,Leamon R.J.,et al. Quantifying the Solar Cycle Modulation of Extreme Space Weather[J],2020,47(11).
APA	Chapman S.C.,McIntosh S.W.,Leamon R.J.,&Watkins N.W..(2020).Quantifying the Solar Cycle Modulation of Extreme Space Weather.Geophysical Research Letters,47(11).
MLA	Chapman S.C.,et al."Quantifying the Solar Cycle Modulation of Extreme Space Weather".Geophysical Research Letters 47.11(2020).