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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.
发表期刊RESEARCH IN ASTRONOMY AND ASTROPHYSICS
2009-10
卷号9期号:10页码:1165-1172
产权排序第1完成单位
收录类别SCI
关键词Sun: Corona Sun: Coronal Mass Ejections (Cmes)
摘要We 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.
项目资助者National Natural Science Foundation of China [10573034, 40636031] ; National Key Research Science Foundation [2006CB806303] ; Chinese Academy of Sciences
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN1674-4527
URL查看原文
归档日期2009-09-15
WOS记录号WOS:000271266300008
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]CORONAL MASS EJECTIONS ; FLUX ; PROPAGATION ; ASYMMETRY ; VELOCITY ; PLASMA ; FLARES
引用统计
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/6131
专题太阳物理研究组
通讯作者Gao, PX (reprint author), Chinese Acad Sci, Yunnan Observ, Natl Astron Observ, Kunming 650011, Peoples R China.
作者单位1.National Astronomical Observatories / Yunnan Observatory, Chinese Academy of Sciences, Kunming 650011, China
2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China
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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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