中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Short-term variability of the Sun-Earth system: an overview of progress made during the CAWSES-II period

文献类型:期刊论文

作者Gopalswamy, Nat1; Tsurutani, Bruce2; Yan, Yihua3
刊名PROGRESS IN EARTH AND PLANETARY SCIENCE
出版日期2015
卷号2期号:1
ISSN号2197-4284
英文摘要This paper presents an overview of results obtained during the CAWSES-II period on the short-term variability of the Sun and how it affects the near-Earth space environment. CAWSES-II was planned to examine the behavior of the solar-terrestrial system as the solar activity climbed to its maximum phase in solar cycle 24. After a deep minimum following cycle 23, the Sun climbed to a very weak maximum in terms of the sunspot number in cycle 24 (MiniMax24), so many of the results presented here refer to this weak activity in comparison with cycle 23. The short-term variability that has immediate consequence to Earth and geospace manifests as solar eruptions from closed-field regions and high-speed streams from coronal holes. Both electromagnetic (flares) and mass emissions (coronal mass ejections - CMEs) are involved in solar eruptions, while coronal holes result in high-speed streams that collide with slow wind forming the so-called corotating interaction regions (CIRs). Fast CMEs affect Earth via leading shocks accelerating energetic particles and creating large geomagnetic storms. CIRs and their trailing high-speed streams (HSSs), on the other hand, are responsible for recurrent small geomagnetic storms and extended days of auroral zone activity, respectively. The latter leads to the acceleration of relativistic magnetospheric 'killer' electrons. One of the major consequences of the weak solar activity is the altered physical state of the heliosphere that has serious implications for the shock-driving and storm-causing properties of CMEs. Finally, a discussion is presented on extreme space weather events prompted by the 23 July 2012 super storm event that occurred on the backside of the Sun. Many of these studies were enabled by the simultaneous availability of remote sensing and in situ observations from multiple vantage points with respect to the Sun-Earth line.
资助项目[NASA's LWS TRT program]
语种英语
源URL[http://ir.bao.ac.cn/handle/114a11/56499]  
专题中国科学院国家天文台
作者单位1.National Aeronautics & Space Administration
2.California Institute of Technology
3.National Astronomical Observatories, Chinese academy of Sciences
推荐引用方式
GB/T 7714
Gopalswamy, Nat,Tsurutani, Bruce,Yan, Yihua. Short-term variability of the Sun-Earth system: an overview of progress made during the CAWSES-II period[J]. PROGRESS IN EARTH AND PLANETARY SCIENCE,2015,2(1).
APA Gopalswamy, Nat,Tsurutani, Bruce,&Yan, Yihua.(2015).Short-term variability of the Sun-Earth system: an overview of progress made during the CAWSES-II period.PROGRESS IN EARTH AND PLANETARY SCIENCE,2(1).
MLA Gopalswamy, Nat,et al."Short-term variability of the Sun-Earth system: an overview of progress made during the CAWSES-II period".PROGRESS IN EARTH AND PLANETARY SCIENCE 2.1(2015).

入库方式: OAI收割

来源:国家天文台

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