标题： 观测到的波动增强和亚阿尔芬太阳风中对WKB理论的偏离 显示英文标题

标题： Observed Fluctuation Enhancement and Departure from WKB Theory in Sub-Alfvénic Solar Wind

摘要： 使用帕克太阳探测器第8至17轨道的数据，我们研究了太阳风流速接近并超过阿尔芬波速度的关键区域内的波动幅度，考虑了等离子体数据的各种特殊情况。 与远离太阳的非相互作用阿尔芬波的WKB理论相反，单位体积内的磁场和动能波动能量并不是单调减少的。 相反，存在标准WKB波作用量守恒的明显破坏，这与之前在阿尔芬临界区域附近太阳风中强烈原位波动能量输入的迹象一致。 这表明由于非线性（湍流）和临界区域附近的大量能量输入导致了WKB理论的强烈破坏，我们认为这可能是由大尺度日冕剪切流驱动的。 显示英文摘要

摘要： Using Parker Solar Probe data from orbits 8 through 17, we examine fluctuation amplitudes throughout the critical region where the solar wind flow speed approaches and then exceeds the Alfv\'en wave speed, taking account of various exigencies of the plasma data. In contrast to WKB theory for non-interacting Alfv\'en waves streaming away from the Sun, the magnetic and kinetic fluctuation energies per unit volume are not monotonically decreasing. Instead, there is clear violation of conservation of standard WKB wave action, which is consistent with previous indications of strong in-situ fluctuation energy input in the solar wind near the Alfv\'en critical region. This points to strong violations of WKB theory due to nonlinearity (turbulence) and major energy input near the critical region, which we interpret as likely due to driving by large-scale coronal shear flows.