关于动力Alfven波的色散与朗道阻尼  

ON THE DISPERSION AND LANDAU DAMPING OF THEKINETIC ALFVEN WAVE

作　　者：宋礼庭[1] 卢先河 

机构地区：[1]北京大学地球物理系,北京100871 [2]中国科学院空间科学和应用研究中心,北京100080

出　　处：《地球物理学报》1999年第2期145-153,共9页Chinese Journal of Geophysics

基　　金：国家自然科学基金!49774249

摘　　要：根据完全动力论理论，证明了可由简化漂移动力论方程求得动力Ａｌｆｖｅｎ波色散方程，即横向用磁流体力学方程，纵向用Ｖｌａｓｏｖ方程，在初级近似下由此推导出适合于日冕和太阳风的色散关系和Ｌａｎｄａｕ阻尼，得到在性质上与ＭＨＤ　Ａｌｆｖｅｎ波完全不同的动力Ａｌｆｖｅｎ波，太阳风中Ａｌｆｖｅｎ湍流很容易由动力Ａｌｆｖｅｎ波演化而来。提出由动力Ａｌｆｒｅｎ波构筑太阳风高速流模型将更符合观测结果。We prove that the dispersion equation of the kinetic Alfven wave obtained byfull kinetic theory can be derived from the so-called drift kinetic approximationequations. These are the hydrodynamic equations for motion transverse to the magneticfield and the Vlasov equation for longitudinal motion. On first approximation thedispersion relation and Landau damping derived by the dispersion equation for theconditions of the solar wind and corona. The kinetic Alfven wave in the nature isquite different from the MHD Alfven wave, so the Alfven turbulence in the solarwind can be easily formed by the kinetic Alfven waves. We present that constructingthe solar wind model from the kinetic Alfven waves will be more consistent with themeasurement.

关 键 词：动力Alfven波 色散方程 湍流 朗道阻尼 日冕 

分 类 号：P182.62[天文地球—天文学] P353.8