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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.; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationJournal of Geophysical Research-Space Physics
2006
Volume111Issue:A9Pages:A09108
ISSN0148-0227
Language英语
KeywordProton Temperature Anisotropy Superposed Epoch Analysis Solar-wind Magnetic Clouds Magnetosheath Magnetopause Instability Mechanism Layer Acceleration
AbstractWe 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.
Indexed BySCI
Funding Project中国科学院空间科学与应用研究中心
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/1048
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
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.,&北京8701信箱.(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.
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