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Plasma sheet stretching accompanied by field aligned energetic ion fluxes observed by the NUADU
Lu L(路立); McKenna-Lawlor, S.; Barabash, S.; Liu ZX(刘振兴); Cao JB(曹晋宾); Balaz, J.; Kudela, K.; Zhang, T. L.; Carr, C. M.; 北京8701信箱
Department空间天气学国家重点实验室
Source PublicationChinese Science Bulletin
2007
Volume52Issue:12Pages:1719-1723
ISSN1001-6538
Language英语
KeywordNear-earth Plasma Sheet Pitch Angle Distribution Energetic Ion Flux Whistler-mode Chorus Detector Cluster Tail
AbstractThe NUADU (NeUtral Atom Detector Unit) instrument aboard TC-2 recorded 4 pi solid angle images of charged particles (E > 180 keV) spiraling around the magnetic field lines in the near-Earth plasma sheet (at similar to -7 RE, equatorial dawn-to-night side) during a geomagnetic storm (Dst =-219 nT) on August 24, 2005. Energetic ion beam events characterized by symmetrical, ring-like, solid angle distributions around ambient magnetic field lines were observed during a 34-minute traversal of the plasma sheet by the TC-2 spacecraft. Also, observations during these multiple crossings of the plasma sheet were monitored by the magnetometer experiment (FGM) aboard the same spacecraft. During each crossing, a whistler-mode chorus enhancement was observed in the anisotropic area by the TC-2 low frequency electromagnetic wave detector (LIFEW/TC-2) at a frequency just above that of the local lower hybrid wave. A comparison of the ion pitch angle distribution (PAD) map with the ambient magnetic field shows that an enhancement in the field aligned energetic ion flux was accompanied by tailward stretching of the magnetic field lines in the plasma sheet. In contrast, the perpendicular ion-flux enhancement was accompanied by a signature indicating the corresponding shrinkage of the magnetic field lines in the plasma sheet. Since both parallel ion-flux and perpendicular ion-flux enhancements occurred intermittently, the data were interpreted to imply a dynamical, oscillatory process of the magnetic field line (stretching and shrinking) in the near-Earth plasma sheet, which might have acted to help establish an interaction region in this area which would support continuous aurora-substorm triggering during the ongoing magnetic storm. The whistler-mode chorus may have been produced due to icon gyro-resonance during particle pitch angle diffusion after the plasma sheet compression.
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/122/1079
Collection空间科学部
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Lu L,McKenna-Lawlor, S.,Barabash, S.,et al. Plasma sheet stretching accompanied by field aligned energetic ion fluxes observed by the NUADU[J]. Chinese Science Bulletin,2007,52(12):1719-1723.
APA 路立.,McKenna-Lawlor, S..,Barabash, S..,刘振兴.,曹晋宾.,...&北京8701信箱.(2007).Plasma sheet stretching accompanied by field aligned energetic ion fluxes observed by the NUADU.Chinese Science Bulletin,52(12),1719-1723.
MLA 路立,et al."Plasma sheet stretching accompanied by field aligned energetic ion fluxes observed by the NUADU".Chinese Science Bulletin 52.12(2007):1719-1723.
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