THE GENERATION AND DAMPING OF PROPAGATING MHD KINK WAVES IN THE SOLAR ATMOSPHERE

THE GENERATION AND DAMPING OF PROPAGATING MHD KINK WAVES IN THE SOLAR ATMOSPHERE
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太阳大气中传播的 MHD 扭结波的产生和阻尼

DOI:
10.1088/0004-637x/784/1/29
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发表时间:
2014
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Morton R
Morton R
中科院分区:
--
文献类型:
--
作者:
Morton R

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将太阳上层大气加热到超过100万度的温度以及将太阳风加速到每秒数百公里所需的非热能的来源尚不清楚。提供所需能量通量的一种机制是不可压缩的扭转阿尔夫萨芬和扭结磁流体动力学(MHD)波,这是由太阳无处不在和复杂的磁场支持的磁主导波。特别是,最近观测到传播MHD扭结波在整个太阳大气中无处不在,但是,直到现在,扭结波能量在整个太阳大气中传输的关键细节还缺乏。在这里,波的普遍性被用于高度动态的太阳色球层的统计研究。这种大规模的研究允许确定色球扭结波速度功率谱,这是确定光球和日冕之间能量传输所必需的缺失环节。至关重要的是,功率谱包含水平光球运动是静止太阳中扭结波产生的重要机制的证据。此外,还首次提供了与实测日冕功率谱的比较,揭示了频率相关的传输曲线,表明在较低的日冕中存在增强的扭结波阻尼。
The source of the non-thermal energy required for the heating of the upper solar atmosphere to temperatures in excess of a million degrees and the acceleration of the solar wind to hundreds of kilometers per second is still unclear. One such mechanism for providing the required energy flux is incompressible torsional Alfvén and kink magnetohydrodynamic (MHD) waves, which are magnetically dominated waves supported by the Sun's pervasive and complex magnetic field. In particular, propagating MHD kink waves have recently been observed to be ubiquitous throughout the solar atmosphere, but, until now, critical details of the transport of the kink wave energy throughout the Sun's atmosphere were lacking. Here, the ubiquity of the waves is exploited for statistical studies in the highly dynamic solar chromosphere. This large-scale investigation allows for the determination of the chromospheric kink wave velocity power spectra, a missing link necessary for determining the energy transport between the photosphere and corona. Crucially, the power spectra contain evidence for horizontal photospheric motions being an important mechanism for kink wave generation in the quiescent Sun. In addition, a comparison with measured coronal power spectra is provided for the first time, revealing frequency-dependent transmission profiles, suggesting that there is enhanced damping of kink waves in the lower corona.
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