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New technique to calculate electron Alfven layer and its application in interpreting geosynchronous access of PS energetic electrons
Zhang, D.; Cao, J. B.; Wei, X. H.; Li, L. Y.; Cao, JB (reprint author), Beihang Univ, Space Sci Inst, Sch Astronaut, Beijing 100191, Peoples R China.
Department空间科学部
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
2015
Volume120Issue:3Pages:1675-1683
ISSN2169-9380
Language英语
KeywordElectron Alfven Layer (u b) Coordinates Particle Drift Theory Geosynchronous Orbit Plasma Sheet
AbstractThe magnetospheric particle drift theory in (U, B) coordinates provides a convenient tool for analyzing particle drift trajectories from plasma sheet to the inner magnetosphere. However, in this drift theory, the Alfven layer for a realistic asymmetric magnetic field model cannot be obtained due to numerical difficulty. In this paper, we developed a new technique to calculate electron Alfven layer for Volland-Stern electrical potential model and dipole+T89 geomagnetic field model. The results show that for realistic asymmetric field models, the dawn and dusk separators are not in the dawn-dusk meridian but asymmetric and tilt toward the dayside. The stagnant point of the electron Alfven layer is always located in the duskside separator. Compared with the electron Alfven layers calculated from Volland-Stern electric field model and dipole magnetic field model, the new electron Alfven layer becomes closer to the Earth and meanwhile rotates clockwise. This rotation makes the point closest to the Earth in the Alfven layer shift from dawnside to nightside. The newly calculated geosynchronous Alfven layer crossings cannot only explain the observed geosynchronous access of plasma sheet thermal (0.913 and 2.783keV) electrons as previous studies did but also the geosynchronous access of plasma sheet energetic (10.472 and 31.039keV) electrons. This new technique can be used to calculate Alfven layer for any asymmetric field models and may become an important compliment to the classical magnetospheric particle drift theory in the (U, B) coordinates.
Indexed BySCI
Document Type期刊论文
Identifierhttp://ir.nssc.ac.cn/handle/122/4661
Collection空间科学部
Corresponding AuthorCao, JB (reprint author), Beihang Univ, Space Sci Inst, Sch Astronaut, Beijing 100191, Peoples R China.
Recommended Citation
GB/T 7714
Zhang, D.,Cao, J. B.,Wei, X. H.,et al. New technique to calculate electron Alfven layer and its application in interpreting geosynchronous access of PS energetic electrons[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2015,120(3):1675-1683.
APA Zhang, D.,Cao, J. B.,Wei, X. H.,Li, L. Y.,&Cao, JB .(2015).New technique to calculate electron Alfven layer and its application in interpreting geosynchronous access of PS energetic electrons.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,120(3),1675-1683.
MLA Zhang, D.,et al."New technique to calculate electron Alfven layer and its application in interpreting geosynchronous access of PS energetic electrons".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 120.3(2015):1675-1683.
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