论文标题
纵向波在Alfvén-Wave驱动的太阳风中的作用
Role of Longitudinal Waves in Alfvén-wave-driven Solar Wind
论文作者
论文摘要
我们重新审视纵向波在驱动太阳风中的作用。我们研究光球上的$ p $ mode样垂直振荡如何影响Alfvén-Wave-Wave驱动风的框架下太阳风的特性。我们执行一系列一维磁水动力学数值模拟，从光球到几十个太阳半径之外。我们发现，质量损失速率随着光球的纵向波幅度的最高幅度急剧增加，最高$ \ sim 4 $ $倍，与经典的理解相反，即声波几乎不会影响太阳风能的能量学。纵向波动的添加诱导色层中的纵向 - 横向波模式转化，从而导致Corona中的AlfvénicPoynting通量增强。因此，促进冠状加热以通过色层蒸发给出较高的冠状密度，从而导致质量减少速率提高。这项研究清楚地表明，长渠道振荡在光球中的重要性以及色层中的模式转化在确定来自太阳能恒星的风的基本特性中的重要性。
We revisit the role of longitudinal waves in driving the solar wind. We study how the the $p$-mode-like vertical oscillation on the photosphere affects the properties of solar winds under the framework of Alfvén-wave-driven winds. We perform a series of one-dimensional magnetohydrodynamical numerical simulations from the photosphere to beyond several tens of solar radii. We find that the mass-loss rate drastically increases with the longitudinal wave amplitude at the photosphere up to $\sim 4$ times, in contrast to the classical understanding that the acoustic wave hardly affects the energetics of the solar wind. The addition of the longitudinal fluctuation induces the longitudinal-to-transverse wave mode conversion in the chromosphere, which results in the enhanced Alfvénic Poynting flux in the corona. Consequently, the coronal heating is promoted to give higher coronal density by the chromospheric evaporation, leading to the increased mass-loss rate. This study clearly shows the importance of the longnitudinal oscillation in the photosphere and the mode conversion in the chromosphere in determining the basic properties of the wind from solar-like stars.
