太阳风中动力论Alfven波的湍流谱(a)朗道衰减

提出一个太阳风中Alfven脉动湍流的新模式,动力论Alfven波是Alfven波和离子声波非解耦的新波模。由太阳向外传播的各种波长的动力Alfven波的非线性相互作用推导出动力论Alfven脉动湍流功率谱P_k,在Alfven半径以外,P_k∝k-3/2,而在Alfven半径以内,由太阳附近的P_k∝k-1变化成P_k∝k-3/2动力论Alfven脉动在Alfven半径以内完成朗道衰减。新模式克服了以前理论模式遇到的困难。 

KINETIC ALFVEN WAVE DAMPING AND POWER SPECTRUM OF TURBULENCE IN THE SOLAR WIND(a)

A new model is presented that Alfvenic turbulence in the solar wind is formedby kinetic Alfven waves assembly.bThe kinetic kAlfven wave is a coupling mode ofAlfyen wave and ion acoustic wave. The kinetic Alfren wave dispersion andLandau damping are derived, and the power spectrum of interplanetary Alfrenicfluctuations is given. When kinetic AlfVen waves with different wave length arepropagating outward from the sun the nonlinear interaction in the waves assemblyevolves the turbulence fluctuations. It is derived that the power spectrum of kinetic Alfrenic turbulence P_k∝k-3/2, with the nonlinear interaction of waves assembly far away from the Alfvenic radius (≈ 0.3AU ). In the inner of Alfvenic pointthe power spectrum P_k changes from P_k∝k-1 near the sun gradually to P_k∝k-3/2with the competition between wave energy cascading and Landau damping. TheLandau damping of the kinetic Alfvenic fluctuations occurs only in the inner ofAlfvenic point and disappears out of Alfvenic radius. This model can overcomethe difficulties of previous theoretical models.