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High-frequency torsional Alfvén waves as an energy source for coronal heating

机译:高频扭转Alfvén波作为冠状加热的能源

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摘要

The existence of the Sun’s hot atmosphere and the solar wind acceleration continues to be an outstanding problem in solar-astrophysics. Although magnetohydrodynamic (MHD) modes and dissipation of magnetic energy contribute to heating and the mass cycle of the solar atmosphere, yet direct evidence of such processes often generates debate. Ground-based 1-m Swedish Solar Telescope (SST)/CRISP, Hα 6562.8?? observations reveal, for the first time, the ubiquitous presence of high frequency (~12–42?mHz) torsional motions in thin spicular-type structures in the chromosphere. We detect numerous oscillating flux tubes on 10 June 2014 between 07:17 UT to 08:08 UT in a quiet-Sun field-of-view of 60”?×?60” (1”?=?725?km). Stringent numerical model shows that these observations resemble torsional Alfvén waves associated with high frequency drivers which contain a huge amount of energy (~105?W?m?2) in the chromosphere. Even after partial reflection from the transition region, a significant amount of energy (~103?W?m?2) is transferred onto the overlying corona. We find that oscillating tubes serve as substantial sources of Alfvén wave generation that provide sufficient Poynting flux not only to heat the corona but also to originate the supersonic solar wind.
机译:太阳炎热的气氛和太阳风加速度的存在仍然是太阳能物理学的出色问题。虽然磁性动力学(MHD)模式和磁能耗散有助于加热和太阳气氛的质量周期,但这种过程的直接证据通常会产生辩论。基于地面的1 M瑞典太阳能望远镜(SST)/脆,Hα6562.8 ??观察结果首次揭示了铬层中薄胚轴型结构中的高频(〜12-42μm≤MHz)扭转运动的无处不在的存在。在安静的太阳视野下,在07:17 ut至08:08 UT之间检测到众多振荡的助焊剂管在60“?×60”(1“?= 725 km)中。严格的数值模型表明,这些观察结果类似于在铬层中含有大量能量(〜105≤m≤2)的高频驱动器相关的扭转Alfvén波。即使在从过渡区域部分反射之后,将大量的能量(〜103→W≤m≤2)转移到覆盖的电晕上。我们发现振荡管作为Alfvén波代的大量来源,提供足够的Poynting助焊剂,不仅可以加热电晕,而且还可以发起超音速太阳风。

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