Is the enhancement of type II radio bursts during CME interactions related to the associated solar energetic particle event?

doi:10.1088/1674-4527/19/1/5

	Is the enhancement of type II radio bursts during CME interactions related to the associated solar energetic particle event?
	Ding, Liu-Guan 1,2; Wang, Zhi-Wei 2; Feng, Li3 ; Li, Gang 4,5; Jiang, Yong 2
刊名	RESEARCH IN ASTRONOMY AND ASTROPHYSICS
	2019
卷号	19 期号:1 页码:14
关键词	Sun: coronal mass ejections (CMEs) Sun: radio radiation Sun: particle emission Sun: CME interaction
ISSN号	1674-4527
DOI	10.1088/1674-4527/19/1/5
通讯作者	Ding, Liu-Guan(dlg@nuist.edu.cn)
英文摘要	We investigated 64 pairs of interacting-CME events identified from simultaneous observations by the SOHO and STEREO spacecraft from January 2010 to August 2014, to examine the relationship between large SEP events in the energy range of similar to 25 to similar to 60 MeV and properties of the interacting CMEs. We found that during CME, interactions, the large SEP events in this study were all generated by CMEs with the presence of enhanced type II radio bursts, which also have wider longitudinal distributions compared to events without a type II radio burst or its enhancement (almost always associated with small SEP events). It seems that the signature of type II radio burst enhancement is a good discriminator between large SEP and small or no SEP event producers during CME interactions. The type II radio burst enhancement is more likely to be generated by CME interactions, with the main CME having a larger speed (v), angular width (WD), mass (m) and kinetic energy (E-k), and taking over the preceding CMEs. The preceding CMEs in these instances have higher v, WD, in and E-k than those in CME, pairs missing type II radio bursts or enhancements. Generally, the values of these properties in the type-II-enhanced events are typically higher than the corresponding non-type-II or non-type-II-enhanced cases for both the main and preceding CMEs. Our analysis also revealed that the intensities of associated SEP events correlate negatively with the intersection height of the two CMEs. Moreover, the overlap width of two CMEs is typically larger in type-II-enhanced events than in non-type-II or non-type-II-enhanced events. Most type-II-enhanced events and SEP events are coincident and are almost always made by the fast and wide main CMEs that sweep fully over relatively slower and narrower preceding CMEs. We suggest that a fast CME with enough energy completely overtaking a relatively narrower preceding CME, especially at low height, can drive a more energetic shock signified by the enhanced type II radio bursts. The shock may accelerate ambient particles (likely provided by the preceding CME) and lead to large SEP events more easily.
WOS关键词	CORONAL MASS EJECTIONS ; ACCELERATION ; SUN ; INTENSITIES ; STEREO ; SHOCKS ; EARTH
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	NATL ASTRONOMICAL OBSERVATORIES, CHIN ACAD SCIENCES
WOS记录号	WOS:000456345900005
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/19229]
专题	中国科学院紫金山天文台
通讯作者	Ding, Liu-Guan
作者单位	1.Nanjing Univ Informat Sci & Technol, Sch Phys & Optoelect Engn, Nanjing 210044, Jiangsu, Peoples R China 2.Nanjing Univ Informat Sci & Technol, Inst Space Weather, Nanjing 210044, Jiangsu, Peoples R China 3.Chinese Acad Sci, Purple Mt Observ, Key Lab Dark Matter & Space Astron, Nanjing 210008, Jiangsu, Peoples R China 4.Univ Alabama, Dept Space Sci, Huntsville, AL 35899 USA 5.Univ Alabama, CSPAR, Huntsville, AL 35899 USA
推荐引用方式 GB/T 7714	Ding, Liu-Guan,Wang, Zhi-Wei,Feng, Li,et al. Is the enhancement of type II radio bursts during CME interactions related to the associated solar energetic particle event?[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2019,19(1):14.
APA	Ding, Liu-Guan,Wang, Zhi-Wei,Feng, Li,Li, Gang,&Jiang, Yong.(2019).Is the enhancement of type II radio bursts during CME interactions related to the associated solar energetic particle event?.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,19(1),14.
MLA	Ding, Liu-Guan,et al."Is the enhancement of type II radio bursts during CME interactions related to the associated solar energetic particle event?".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 19.1(2019):14.