论文标题
两流体波的生成太阳能球体加热和冠状流出
Generation of solar chromosphere heating and coronal outflows by two-fluid waves
论文作者
论文摘要
语境。众所周知,Alfvén和磁性波都有助于加热太阳能球体和驱动血浆流出。在这两种情况下,波能的热化都是由于离子中性碰撞而引起的,但是获得的血浆加热速率无法解释观察数据。流出的大小也是如此。 目标。本文的目的是重新检查部分离子化的太阳能球体中Alfvén和磁性波的两流体建模。我们试图检测离子温度的变化,而垂直等离子体流向不同的波组合。 方法。我们使用Joanna代码对耦合的Alfvén和磁性波的产生和演变进行了数值模拟,该代码求解了离子(质子)+电子和中性(氢原子)的两流体方程,并通过碰撞项结合。 结果。我们确认,冲动产生的小振幅波的阻尼可忽略地影响染色体温度,并仅产生缓慢的血浆流量。相反,大振幅脉冲产生的波显着提高了色圈温度,并导致血浆流出更快。当从光球的中心发射脉冲时,最大加热发生,相关等离子体流的大小随脉冲的振幅增加。结论。大振幅耦合的两流体壁和磁性波可以显着有助于加热太阳能球层和血浆流出的产生。
Context. It is known that Alfvén and magnetoacoustic waves both contribute to the heating of the solar chromosphere and drive plasma outflows. In both cases, the thermalization of the wave energy occurs due to ion-neutral collisions, but the obtained rates of plasma heating cannot explain the observational data. The same is true for the magnitudes of the outflows. Aims. The aim of the present paper is to reexamine two-fluid modeling of Alfvén and magnetoacoustic waves in the partially ionized solar chromosphere. We attempt to detect variations in the ion temperature, and vertical plasma flows for different wave combinations. Methods. We performed numerical simulations of the generation and evolution of coupled Alfvén and magnetoacoustic waves using the JOANNA code, which solves the two-fluid equations for ions (protons)+electrons and neutrals (hydrogen atoms), coupled by collision terms. Results. We confirm that the damping of impulsively generated small-amplitude waves negligibly affects the chromosphere temperature and generates only slow plasma flows. In contrast, waves generated by large-amplitude pulses significantly increase the chromospheric temperature and result in faster plasma outflows. The maximum heating occurs when the pulse is launched from the center of the photosphere, and the magnitude of the related plasma flows increases with the amplitude of the pulse. Conclusions. Large-amplitude coupled two-fluid Alfvén and magnetoacoustic waves can significantly contribute to the heating of the solar chromosphere and to the generation of plasma outflows.