WANG ZhiWei,
DING LiuGuan,
ZHOU KunLun et al
.2018.On the relationship between large SEP event and twin-CME with the observations from multiple-vantage spacecraft Chinese Journal of Geophysics(in Chinese),61(9): 3515-3525,doi: 10.6038/cjg2018L0709
On the relationship between large SEP event and twin-CME with the observations from multiple-vantage spacecraft
WANG ZhiWei1, DING LiuGuan1,2, 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
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.
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