Plasma depletion and mirror waves ahead of interplanetary coronal mass ejections

	Plasma depletion and mirror waves ahead of interplanetary coronal mass ejections
	Liu, Y. ; Richardson, J. D. ; Belcher, J. W. ; Kasper, J. C. ; Skoug, R. M.
刊名	Journal of Geophysical Research-Space Physics
	2006
卷号	111 期号:A9 页码:A09108
关键词	proton temperature anisotropy superposed epoch analysis solar-wind magnetic clouds magnetosheath magnetopause instability mechanism layer acceleration
ISSN号	0148-0227
通讯作者	北京8701信箱
英文摘要	We find that the sheath regions between fast interplanetary coronal mass ejections (ICMEs) and their preceding shocks are often characterized by plasma depletion and mirror wave structures, analogous to planetary magnetosheaths. A case study of these signatures in the sheath of a magnetic cloud ( MC) shows that a plasma depletion layer (PDL) coincides with magnetic field draping around the MC. In the same event, we observe an enhanced thermal anisotropy and plasma beta as well as anticorrelated density and magnetic fluctuations which are signatures of mirror mode waves. We perform a superposed epoch analysis of ACE and Wind plasma and magnetic field data from different classes of ICMEs to illuminate the general properties of these regions. For MCs preceded by shocks, the sheaths have a PDL with an average duration of 6 hours ( corresponding to a spatial span of about 0.07 AU) and a proton temperature anisotropy T-perpendicular to p/ T-parallel to p similar or equal to 1.2 - 1.3, and are marginally unstable to the mirror instability. For ICMEs with preceding shocks which are not MCs, plasma depletion and mirror waves are also present but at a reduced level. ICMEs without shocks are not associated with these features. The differences between the three ICME categories imply that these features depend on the ICME geometry and the extent of upstream solar wind compression by the ICMEs. We discuss the implications of these features for a variety of crucial physical processes including magnetic reconnection, formation of magnetic holes, and energetic particle modulation in the solar wind.
学科主题	空间物理
收录类别	SCI
原文出处	http://www.agu.org/pubs/crossref/2006/2006JA011723.shtml
语种	英语
内容类型	期刊论文
源URL	[http://ir.cssar.ac.cn/handle/122/1048]
专题	国家空间科学中心_空间科学部
推荐引用方式 GB/T 7714	Liu, Y.,Richardson, J. D.,Belcher, J. W.,et al. Plasma depletion and mirror waves ahead of interplanetary coronal mass ejections[J]. Journal of Geophysical Research-Space Physics,2006,111(A9):A09108.
APA	Liu, Y.,Richardson, J. D.,Belcher, J. W.,Kasper, J. C.,&Skoug, R. M..(2006).Plasma depletion and mirror waves ahead of interplanetary coronal mass ejections.Journal of Geophysical Research-Space Physics,111(A9),A09108.
MLA	Liu, Y.,et al."Plasma depletion and mirror waves ahead of interplanetary coronal mass ejections".Journal of Geophysical Research-Space Physics 111.A9(2006):A09108.