王智伟^1,,
丁留贯^1,2,,,
周坤论¹,
乐贵明³
1. 南京信息工程大学空间天气研究所, 南京 210044
2. 南京信息工程大学物理与光电工程学院, 南京 210044
3. 国家空间天气监测预警中心, 中国气象局, 北京 100081

基金项目: 国家自然科学基金天文联合基金（U1731105），青年科学基金（41304150），江苏省基础研究计划面上项目（BK20171456）和江苏省青蓝工程项目联合资助


详细信息

作者简介: 王智伟, 男, 1993年生, 硕士, 主要从事太阳高能粒子相关研究.E-mail:idwzw@qq.com

通讯作者: 丁留贯, 男, 1979年生, 副教授, 主要从事空间物理及空间天气学的研究.E-mail:dlg@nuist.edu.cn

中图分类号: P353

收稿日期:2017-11-13
修回日期:2018-05-20
上线日期:2018-09-05

On the relationship between large SEP event and twin-CME with the observations from multiple-vantage spacecraft

WANG ZhiWei^1,,
DING LiuGuan^1,2,,,
ZHOU KunLun¹,
LE GuiMing³
1. Institute of Space Weather, Nanjing University of Information Science and Technology, Nanjing 210044, China
2. School of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
3. Key Laboratory of Space Weather, National Center for Space Weather, China Meteorological Administration, Beijing 100081, China


More Information

Corresponding author: DING LiuGuan,E-mail:dlg@nuist.edu.cn

MSC: P353

--> Received Date: 13 November 2017
Revised Date: 20 May 2018
Available Online: 05 September 2018


摘要
摘要:本文联合SOHO和STEREO-A/B（三视角）日冕观测和太阳高能粒子（SEP）观测，分析了2007—2014年间169个快速（速度>900 km·s^-1）、宽角度（>60°）日冕物质抛射（CME）及其先行CME和关联SEP事件.通过相关分析，给出了SOHO/EPHIN 25~53MeV及STEREO/HET 23.8~60 MeV能量范围的大SEP事件通量判断阈值，分别为0.01和0.014（cm²·s·sr·MeV）^-1.三视角CME观测能有效地避免投影效应产生的twin-CME事件误判，统计得到单一视角确定twin-CME事件的误判率一般低于10%，最高不超过15%.基于三视角判断的twin-CME事件及SEP事件峰值强度，得到判断twin-CME事件的时间阈值最短约为9 h（9~13 h）.single-CME产生的SEP事件强度与CME速度、动能的相关性明显高于twin-CME，并且三视角下的相关性结果与单视角类似.结果表明，一个主CME可能存在多个先行CME，依据单卫星观测判断先行CME时有一定的误判几率，但少数单个先行CME的误判并不影响基于单卫星的统计规律或统计结果.
关键词: 太阳高能粒子/
日冕物质抛射/
twin-CME/
多视角观测

Abstract:In this paper, we investigated 169 fast and wide coronal mass ejection (CME) and their associated solar energetic particle (SEP) events detected by SOHO and STEREO-A/B spacecraft from three-vantage viewpoints from 2007 to 2014. The flux threshold of defining a large SEP event was suggested to be 0.01 and 0.014 (cm²s·sr·MeV)^-1 respectively for SOHO/EPHIN at 25~53 MeV and STEREO/HET at 23.8~60 MeV. The multiple-vantage observations can well rule out some misidentifications of twin-CME events due to the projection effect of CME detection. The results show that the percentage of misidentified twin-CMEs by only one spacecraft SOHO is generally lower than 10%, and not more than 15% ultimately. The time interval threshold of identifying a preceding CME ahead a main CME should be larger than about 9 hours and less than 13 hours from the analysis by three-vantage spacecraft. The correlation between SEP intensity and the speed, kinetic energy of CME is significantly higher for single-CME events than that for twin-CME events. From three-vantage observations, the statistical results is generally consistent with those results only from single-one view. Because one CME usually has more than one preceding CMEs, it seems to be shown that there is no obvious effects on the results from single-view observations in statistical analysis despite of the misidentification of few preceding CMEs.
Key words:Solar energetic particle/
Coronal mass ejection/
Twin-CME/
Multiple-vantage observation



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