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A cyclic behavior of CME accelerations for accelerating and decelerating events
Gao PX(高朋鑫)1,2; Li KJ(李可军)1; Gao, PX (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
2009-10
Volume9Issue:10Pages:1165-1172
Contribution Rank第1完成单位
Indexed BySCI
KeywordSun: Corona Sun: Coronal Mass Ejections (Cmes)
AbstractWe investigate the cyclic evolutionary behavior of CME accelerations for accelerating and decelerating CME events in cycle 23 from 1997 January to 2007 December. It is found that the absolute values of semiannual mean accelerations of both accelerating and decelerating CME events roughly wax and wane in a cycle, delaying the sunspot cycle in time phase. We also investigate the semiannual number of CMEs with positive and negative acceleration and find that there are more decelerating CME events than accelerating CME events during the maximum period of a cycle (about three years), but there are more accelerating CME events than decelerating CME events during the rest of the time interval of the cycle. Our results seem to suggest that the different driving mechanisms may be acting accelerate and decelerate CME events: for accelerating CME events, the propelling force (F(p)) statistically seems to play a significant role in pushing CMEs outward; for decelerating CME events, the drag (F(d)) statistically seems to play a more effective role in determining CME kinematic evolution in the outer corona. During the maximum period of a cycle, because of the V(2) dependence, F(d) is generally stronger; because of the magnetic field dependence, F(p) is also generally stronger. Thus, the absolute values of both the negative and positive accelerations are generally larger during that time. Because of the V(2) dependence, F(p) may be more effective during the maximum period of a cycle. Hence, there are more decelerating CME events than accelerating CME events during that time. During the minimum time interval of a cycle, CMEs have relatively small speeds, and F(p) may be more effective. Therefore, there are more accelerating CME events than decelerating CME events during that time.
Funding OrganizationNational Natural Science Foundation of China [10573034, 40636031] ; National Key Research Science Foundation [2006CB806303] ; Chinese Academy of Sciences
Language英语
Subject AreaAstronomy & Astrophysics
SubtypeArticle
ISSN1674-4527
URL查看原文
Archive Date2009-09-15
WOS IDWOS:000271266300008
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS KeywordCORONAL MASS EJECTIONS ; FLUX ; PROPAGATION ; ASYMMETRY ; VELOCITY ; PLASMA ; FLARES
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Document Type期刊论文
Identifierhttp://ir.ynao.ac.cn/handle/114a53/6131
Collection太阳物理研究组
Corresponding AuthorGao, PX (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
Affiliation1.National Astronomical Observatories / Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China
First Author AffilicationYunnan Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Gao PX,Li KJ,Gao, PX . A cyclic behavior of CME accelerations for accelerating and decelerating events[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2009,9(10):1165-1172.
APA Gao PX,Li KJ,&Gao, PX .(2009).A cyclic behavior of CME accelerations for accelerating and decelerating events.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,9(10),1165-1172.
MLA Gao PX,et al."A cyclic behavior of CME accelerations for accelerating and decelerating events".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 9.10(2009):1165-1172.
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