Using a semi-phenomenological model of the imbalanced Alfvenic turbulence, we study the turbulence transition from magnetohydrodynamic to sub-ion kinetic scales in the conditions typical for the fast solar wind. We show that the transition takes place in a wide wave number interval where the energy spectrum does not follow any power law. For larger turbulence imbalances, both boundaries of the transition wave number interval shift to larger scales. The energy exchange between dominant and subdominant components of the turbulence is essential in the model reducing the imbalance at kinetic scales; however, the total balance is never reached. Our results are compatible with recent solar wind observations at ion scales and numerical simulations of imbalanced turbulence.

中文翻译：

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太阳风中离子动力学尺度的不平衡阿尔文湍流的频谱

使用不平衡阿尔芬湍流的半现象学模型，我们研究了在快速太阳风的典型条件下从磁流体动力学到亚离子动力学尺度的湍流转变。我们表明跃迁发生在宽波数区间内，其中能谱不遵循任何幂律。对于更大的湍流不平衡，过渡波数区间的两个边界都向更大的尺度移动。湍流的主要和次要分量之间的能量交换在模型中是必不可少的，可以减少动力学尺度上的不平衡；然而，从未达到总余额。我们的结果与最近在离子尺度上的太阳风观测和不平衡湍流的数值模拟相一致。