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Kinetic Alfven wave instability driven by a field-aligned current in high-beta plasmas
Chen, L.1,2; Wu, D. J.1; Hua, Y. P.1,2
Source PublicationPHYSICAL REVIEW E
AbstractIncluding the ion-gyroradius effect, a general low-frequency kinetic dispersion equation is presented, which simultaneously takes account of a field-aligned current and temperature anisotropy in plasmas. Based on this dispersion equation, kinetic Alfven wave (KAW) instability driven by the field-aligned current, which is carried by the field-aligned drift of electrons relative to ions at a drift velocity V-D, is investigated in a high-beta plasma, where beta is the kinetic-to-magnetic pressure ratio in the plasma. The numerical results show that the KAW instability driven by the field-aligned current has a nonzero growth rate in the parallel wave-number range 0 < k(z) < k(z)(u), where the growth rate reaches a maximum at k(z) similar to k(z)(u)/2. On the other hand, in the perpendicular wave-number range 0 < k(perpendicular to) < k(perpendicular to)(u) the growth rate monotonously decreases with the wave number k(perpendicular to) from a maximum at k(perpendicular to) = 0 to zero at k(perpendicular to) = k(perpendicular to)(u). In particular, the upper boundaries of the growing ranges in the wave-number space, k(z)(u) and k(perpendicular to)(u), as well as the growth rate increase with V-D, imply that there are wider growing ranges and larger growth rate for larger drift velocities. Including the temperature anisotropy of plasma particles, the result shows that the instability conditions for these two driven mechanisms are both modified considerably, in which the growing parametric ranges of KAWs widen. The results have potential importance in understanding the physics of space and astrophysical plasma active phenomena since the field-aligned current, also called the Birkeland current, is one of the most active factors in plasma phenomena.
KeywordCoronal Loop Oscillations Electron Acceleration Nonlinear Excitation Transition-region Hose Instability Solar Atmosphere Mode Conversion Magnetic-field Current Sheets Heavy-ions
Subject AreaPhysics
WOS HeadingsScience & Technology ; Physical Sciences
Indexed BySCI
WOS Research AreaPhysics
WOS SubjectPhysics, Fluids & Plasmas ; Physics, Mathematical
WOS IDWOS:000296526600004
Citation statistics
Cited Times:17[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
Chen, L.,Wu, D. J.,Hua, Y. P.. Kinetic Alfven wave instability driven by a field-aligned current in high-beta plasmas[J]. PHYSICAL REVIEW E,2011,84(4):046406.
APA Chen, L.,Wu, D. J.,&Hua, Y. P..(2011).Kinetic Alfven wave instability driven by a field-aligned current in high-beta plasmas.PHYSICAL REVIEW E,84(4),046406.
MLA Chen, L.,et al."Kinetic Alfven wave instability driven by a field-aligned current in high-beta plasmas".PHYSICAL REVIEW E 84.4(2011):046406.
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