Are all leading shocks driven by magnetic clouds?

CORC > 紫金山天文台 > 中国科学院紫金山天文台 > 太阳和太阳系等离子体研究团组

	Are all leading shocks driven by magnetic clouds?
	Feng, H. Q.1,2; Wu, D. J.3; Chao, J. K.4; Lee, L. C.4; Lyu, L. H.4
刊名	JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
	2010-04-30
卷号	115 页码:A04107
关键词	CORONAL MASS EJECTIONS INTER-PLANETARY SHOCK SOLAR-WIND FLUX ROPE FIELD STRUCTURE CONSTANT-ALPHA CROSS-SECTION 1 AU EVENTS TOPOLOGY
ISSN号	0148-0227
英文摘要	Magnetic clouds (MCs) are commonly observed in association with shocks at 1 AU, and many authors have claimed that the leading shocks are driven by MCs, without any direct evidence. In this work we surveyed the relations between MCs and their associated shocks. Using the interplanetary plasma and magnetic field data measured by Wind, we have identified 97 MCs near Earth during 1995 to 2007. Sixty-two (64%) of the MCs were associated with leading shocks. As Lepping et al. have pointed out, if a leading shock is driven by an MC, the axis of the driver should be approximately perpendicular to the shock normal. We calculated the angle theta between the axis of the MC and its leading shock normal and found that the angle theta for 21 of the 62 MCs deviates from 90 degrees by more than 25 degrees. Seventeen of the 21 MCs also have the following signatures: (1) The MC leading edge moves more slowly than the preceding shock; and (2) the time interval between the preceding shock and the front boundary of the MC is always long, with an average period of 15.4 h. The speed profiles of the other four events revealed that the leading shock was driven not directly by the MC but by the immediately subsequent flow, and their sheath durations are shorter than the time interval between the preceding shocks and the MC front boundaries. Therefore, at least 21 (34%) of 62 leading shocks were not directly driven by MCs.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	CORONAL MASS EJECTIONS ; INTER-PLANETARY SHOCK ; SOLAR-WIND ; FLUX ROPE ; FIELD STRUCTURE ; CONSTANT-ALPHA ; CROSS-SECTION ; 1 AU ; EVENTS ; TOPOLOGY
收录类别	SCI
语种	英语
WOS记录号	WOS:000277266000003
公开日期	2011-11-23
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/1105]
专题	紫金山天文台_太阳和太阳系等离子体研究团组
作者单位	1.Luoyang Normal Univ, Coll Phys & Elect Informat, Luoyang 471022, Peoples R China 2.Chinese Acad Sci, State Key Lab Space Weather, Ctr Space Sci & Appl Res, Beijing, Peoples R China 3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 4.Natl Cent Univ, Inst Space Sci, Jhongli, Taiwan
推荐引用方式 GB/T 7714	Feng, H. Q.,Wu, D. J.,Chao, J. K.,et al. Are all leading shocks driven by magnetic clouds?[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2010,115:A04107.
APA	Feng, H. Q.,Wu, D. J.,Chao, J. K.,Lee, L. C.,&Lyu, L. H..(2010).Are all leading shocks driven by magnetic clouds?.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,115,A04107.
MLA	Feng, H. Q.,et al."Are all leading shocks driven by magnetic clouds?".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 115(2010):A04107.