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Parallel-dominant and perpendicular-dominant components of the fast bulk flow: Comparing with the PSBL beams
Zhang, L. Q.; Dai, L.; Baumjohann, W.; Reme, H.; Dunlop, M. W.; Wei, X. H.; Zhang, LQ (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2015
Volume120Issue:11Pages:9500-9512
ISSN2169-9380
Language英语
AbstractUtilizing multipoint observations by the Cluster satellites, we investigated the ion distributions of the fast bulk flows (FBFs) in the plasma sheet. Simultaneous observation by C1 and C3 revealed that parallel-dominant and perpendicular-dominant components of the flows coexist and correspond to B-x-dominant and B-z-dominant magnetic field regions within the FBFs, respectively. In both cases, the ions distributions are characterized by a single-beam/crescent shape. In particular, no reflected ions are found within the FBFs. Statistical analysis showed that within the FBFs, the strength of the B-x component is typically less than 5 nT for B-z-dominant regions and above 10 nT for B-x-dominant regions. To distinguish between the parallel-dominant component of the FBFs and the field-aligned beams in the plasma sheet boundary layer (PSBL), we further statistically analyzed the tailward parallel flows (TPF) with positive B-z in the plasma sheet. The results indicated that the FBFs tend to have higher velocity, weaker B, and higher magnetic tilt angle (theta(MTA)) than the TPFs/PSBL beams. Statistically, in the region of B > 30 nT (theta(MTA) > 10 degrees), only PSBL beams can be observed, while in the region of B < 10 nT (theta(MTA) > 30 degrees), the FBFs are dominant. In the intermediate region (10 degrees < theta(MTA) < 30 degrees) of the plasma sheet, the FBFs and the PSBL beams cooccur. These Cluster observations suggest that the X line can produce both perpendicular flow in central plasma sheet and parallel flow in the PSBL. In addition, the parallel-dominant component of the FBFs could be an important origin for the PSBL beams.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/5345
Collection空间科学部
Corresponding AuthorZhang, LQ (reprint author), Chinese Acad Sci, Natl Space Sci Ctr, State Key Lab Space Weather, Beijing, Peoples R China.
Recommended Citation
GB/T 7714
Zhang, L. Q.,Dai, L.,Baumjohann, W.,et al. Parallel-dominant and perpendicular-dominant components of the fast bulk flow: Comparing with the PSBL beams[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2015,120(11):9500-9512.
APA Zhang, L. Q..,Dai, L..,Baumjohann, W..,Reme, H..,Dunlop, M. W..,...&Zhang, LQ .(2015).Parallel-dominant and perpendicular-dominant components of the fast bulk flow: Comparing with the PSBL beams.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,120(11),9500-9512.
MLA Zhang, L. Q.,et al."Parallel-dominant and perpendicular-dominant components of the fast bulk flow: Comparing with the PSBL beams".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 120.11(2015):9500-9512.
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2015jgra52224.pdf(2954KB)期刊论文作者接受稿开放获取CC BY-NC-SAApplication Full Text
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