PMO OpenIR  > 太阳和太阳系等离子体研究团组
Model of auroral electron acceleration by dissipative nonlinear inertial Alfven wave
Wu, DJ; Chao, JK
2004-06-22
Source PublicationJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
ISSN0148-0227
Volume109Issue:A6Pages:A06211
AbstractIn a recent work [Wu, 2003a, 2003b], a dissipative nonlinear inertial Alfven wave (DNIAW) were proposed as the physical explanation for the formation of the strong electric spikes often observed in the auroral ionosphere and the magnetosphere. DNIAW can also lead to the field_aligned electron acceleration. In the present paper, dynamical characteristics of DNIAW acceleration are discussed and its possible role in auroral electron acceleration is further investigated. The effective acceleration region for auroral electrons with energies of the order of keV produced by DNIAW acceleration is between 0.5 and 2.5 R-E above the ionosphere, and the most efficient acceleration occurs around 0.8 R-E where both the Alfven velocity and the produced auroral electron energy peak, and the peak energy is around 10 keV. We suggest that this could explain the precipitous decrease of the auroral electron energy spectrum toward energies above 10 keV, which can be inferred from measurements of energy distribution of precipitating auroral electrons. Typical widths of auroral arcs caused by the DNIAW acceleration are in scales of the order of 1 km.
KeywordAuroral Phenomena Energetic Particle Precipitating Magnetosphere-ionosphere Interactions Kinetic And Mhd Theory Nonlinear Phenomena
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1029/2003JA010126
WOS KeywordION-ACOUSTIC-WAVES ; LOW-BETA-PLASMA ; PARTICLE-ACCELERATION ; ANOMALOUS RESISTIVITY ; DOUBLE-LAYERS ; IONOSPHERE ; TEMPERATURE ; ALTITUDE ; DENSITY ; SHOCKS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000222778000002
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/7761
Collection太阳和太阳系等离子体研究团组
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Natl Cent Univ, Inst Space Sci, Chungli 32001, Taiwan
3.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China
Recommended Citation
GB/T 7714
Wu, DJ,Chao, JK. Model of auroral electron acceleration by dissipative nonlinear inertial Alfven wave[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,2004,109(A6):A06211.
APA Wu, DJ,&Chao, JK.(2004).Model of auroral electron acceleration by dissipative nonlinear inertial Alfven wave.JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS,109(A6),A06211.
MLA Wu, DJ,et al."Model of auroral electron acceleration by dissipative nonlinear inertial Alfven wave".JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 109.A6(2004):A06211.
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