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Influence of Magnetic Clouds on Variations of Cosmic Rays in November 2004
Yu XX(于晓霞); Lu H(卢红); Shi F(石峰); Yu, XX; Lu, H; Le, GM; Shi, F
2010
发表期刊SOLAR PHYSICS
卷号263期号:1-2页码:#REF!
通讯作者Yu, XX (reprint author), Chinese Acad Sci, Key Lab Particle Astrophys, Inst High Energy Phys, Beijing 100049, Peoples R China.
摘要We investigate the effects of two magnetic clouds on hourly cosmic-ray intensity profiles in the Forbush decrease events in November 2004 observed by 47 ground-based neutron-monitor stations. By using a wavelet decomposition, the start time of the main phase in a Forbush decrease event can be defined, and then clearer definitions of initial phase, main phase, and recovery phase are proposed. Our analyses suggest that the main phase of this Fd event precedes the arrival time of the first magnetic cloud by about three hours, and the Fds observed at the majority (39/47) of the stations were found to originate from the sheath region as indicated by large fluctuations in magnetic field vectors at 19: 00 UT on 7 November 2004, regardless of the station location. In addition, about 45% of the onset times of the recovery phase in the Forbush decreases took place at 04: 00 UT on 10 November, independent of the station position. The results presented here support the hypothesis that the sheath region between the shock and the magnetic cloud, especially the enhanced turbulent magnetic field, results in the scattering of cosmic-ray particles, and causes the following Forbush decreases. Analysis of variation profiles from different neutron monitors reveals the global simultaneity of this Forbush decrease event. Moreover, we infer that the interplanetary disturbance was asymmetric when it reached the Earth, inclined to the southern hemisphere. These results provide several observational constraints for more detailed simulations of the Forbush decrease events with time-dependent cosmic-ray modulation models.
文章类型Article
关键词Coronal mass ejections (CMEs) Cosmic rays Forbush decreases (Fds) Magnetic cloud (MC) Magnetic fields
学科领域Astronomy & Astrophysics
DOI10.1007/s11207-010-9522-7
收录类别SCI
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000277148200016
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被引频次:16[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/227041
专题粒子天体物理中心
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GB/T 7714
Yu XX,Lu H,Shi F,et al. Influence of Magnetic Clouds on Variations of Cosmic Rays in November 2004[J]. SOLAR PHYSICS,2010,263(1-2):#REF!.
APA 于晓霞.,卢红.,石峰.,Yu, XX.,Lu, H.,...&Shi, F.(2010).Influence of Magnetic Clouds on Variations of Cosmic Rays in November 2004.SOLAR PHYSICS,263(1-2),#REF!.
MLA 于晓霞,et al."Influence of Magnetic Clouds on Variations of Cosmic Rays in November 2004".SOLAR PHYSICS 263.1-2(2010):#REF!.
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