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Reformed solitary kinetic alfven waves due to dissipations and auroral electron acceleration
Wu, DJ; Chao, JK; Lee, LC; Feng, XS
AbstractThe physical nature of the auroral electron acceleration has been an outstanding problem in space physics for decades. Some recent observations from the auroral orbit satellites, FREJA and FAST, showed that large amplitude solitary kinetic Alfven waves (SKAWs) are a common electromagnetic active phenomenon in the auroral magnetosphere. In a low-beta (i.e., beta /2 << m(e)/m(i) << 1) plasma, the drift velocity of electrons relative to ions within SKAWs is much larger than thermal velocities of both electrons and ions. This leads to instabilities and causes dissipations of SKAWs. in the present work, based on the analogy of classical particle motion in a potential well, it is shown that a shock-like structure can be formed from SKAWs if dissipation effects are included. The reformed SKAWs with a shock-like structure have a local density jump and a net field-aligned electric potential drop of order of m(e)v(A)(2)/e over a characteristic width of several lambda (e). As a consequence, the reformed SKAWs can efficiently accelerate electrons field-aligned to the order of the local Alfven velocity. In particular, we argue that this electron acceleration mechanism by reformed SKAWs can play an important role in the auroral electron acceleration problem. The result shows that not only the location of acceleration regions predicted by this model is well consistent with the observed auroral electron acceleration region of 1-2 R-E above the auroral ionosphere, but also the accelerated electrons from this region can obtain an energy of several keV and carry a field-aligned current of several muA/m(2) which are comparable to the observations of auroral electrons.
KeywordSpace Plasma Auroral Electron Acceleration Solitary Kinetic Alfven Wave
Subject AreaPhysics
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaPhysics
WOS SubjectPhysics, Multidisciplinary
WOS IDWOS:000169609100017
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Document Type期刊论文
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
3.Natl Cent Univ, Inst Space Sci, Taipei, Taiwan
4.Natl Cheng Kung Univ, Coll Sci, Tainan 70101, Taiwan
5.Chinese Acad Sci, Ctr Space Sci & Applicat Res, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Wu, DJ,Chao, JK,Lee, LC,et al. Reformed solitary kinetic alfven waves due to dissipations and auroral electron acceleration[J]. COMMUNICATIONS IN THEORETICAL PHYSICS,2001,35(5):597-604.
APA Wu, DJ,Chao, JK,Lee, LC,&Feng, XS.(2001).Reformed solitary kinetic alfven waves due to dissipations and auroral electron acceleration.COMMUNICATIONS IN THEORETICAL PHYSICS,35(5),597-604.
MLA Wu, DJ,et al."Reformed solitary kinetic alfven waves due to dissipations and auroral electron acceleration".COMMUNICATIONS IN THEORETICAL PHYSICS 35.5(2001):597-604.
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