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Kinetic Alfven waves driven by velocity shear
Wang, X. Y.; Liu, Z. X.; Li, Z. Y.; Zhang, X. B.; 北京8701信箱
Source PublicationPhysics of Plasmas
KeywordPeriod Magnetic Pulsations Excitation Turbulence Aurora
AbstractConsidering the effect of the finite ion gyroradius, the kinetic Alfven wave in an anisotropic medium driven by a parallel velocity flow was investigated and the full dispersion relation was given. Zn deducing the dispersion relation, the coupling between electrostatic and electromagnetic oscillations, effects of the resonant electrons and the longitudinal motion of ions are considered. Based on the analytical and numerical calculations, two instability boundaries are found. They are 1<(k(perpendicular to)dV(0)/dx)/k(z) omega(ci)upsilon(A)(2)/(T-i/m(i)). Resonant electrons serve as the main energy source in these two regimes, while the ion longitudinal motion only suppresses the mode in the second regime. In the boundary layer of the magnetopause, the temperature anisotropy also modifies the instability by lowering the frequency and reducing the growth rate, The above results shaw that the low-frequency Alfven waves with the scale of perpendicular wavelengths greater than the ion gyroradius in the magnetopause can be efficiently driven by a velacity-sheared flow.
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
Corresponding Author北京8701信箱
Recommended Citation
GB/T 7714
Wang, X. Y.,Liu, Z. X.,Li, Z. Y.,et al. Kinetic Alfven waves driven by velocity shear[J]. Physics of Plasmas,1998,5(4):836-840.
APA Wang, X. Y.,Liu, Z. X.,Li, Z. Y.,Zhang, X. B.,&北京8701信箱.(1998).Kinetic Alfven waves driven by velocity shear.Physics of Plasmas,5(4),836-840.
MLA Wang, X. Y.,et al."Kinetic Alfven waves driven by velocity shear".Physics of Plasmas 5.4(1998):836-840.
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