Reconnection nanojets in the solar corona
Reconnection nanojets in the solar corona
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DOI：
10.1038/s41550-020-1199-8
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发表时间：
2020-09-21
期刊：
影响因子：
14.1
通讯作者：
Reale, Fabio
中科院分区：
文献类型：
--
作者：
Antolin, Patrick;Pagano, Paolo;Reale, Fabio
日冕的形状被太阳的磁场神秘地加热到数百万度。长期以来，人们一直假设，这种加热是由无数被称为纳米耀斑的微小磁能爆发造成的，这种能量爆发是由磁重联的基本过程驱动的。不对齐的磁力线可以断裂和重新连接，产生类似雪崩的纳米耀斑。然而，到目前为止，还没有对这种纳米耀斑的直接和独特的观测，而且缺乏确凿的证据，这使得人们对解决日冕加热问题的可能性产生了怀疑。从协调的多波段高分辨率观测中，我们报告了非常快速和爆发的纳米射流的发现，这是基于重连的纳米耀斑导致日冕加热的标志。利用最先进的数值模拟，我们证明了纳米射流是由磁拉紧的弹弓效应引起的，弯曲的磁力线以小角度重新连接。因此，纳米射流是基于重联的日冕加热的关键特征。多波段高分辨率观测揭示了非常快速和爆发的纳米射流。这些纳米喷流是弹弓效应的结果，这是由磁张力引起的，弯曲的磁力线以小角度重新连接，导致日冕加热。
The solar corona is shaped and mysteriously heated to millions of degrees by the Sun's magnetic field. It has long been hypothesized that the heating results from a myriad of tiny magnetic energy outbursts called nanoflares, driven by the fundamental process of magnetic reconnection. Misaligned magnetic field lines can break and reconnect, producing nanoflares in avalanche-like processes. However, no direct and unique observations of such nanoflares exist to date, and the lack of a smoking gun has cast doubt on the possibility of solving the coronal heating problem. From coordinated multi-band high-resolution observations, we report on the discovery of very fast and bursty nanojets, the telltale signature of reconnection-based nanoflares resulting in coronal heating. Using state-of-the-art numerical simulations, we demonstrate that the nanojet is a consequence of the slingshot effect from the magnetically tensed, curved magnetic field lines reconnecting at small angles. Nanojets are therefore the key signature of reconnection-based coronal heating in action.Multi-band high-resolution observations reveal very fast and bursty nanojets. These nanojets are a consequence of the slingshot effect from magnetically tensed, curved magnetic field lines reconnecting at small angles, resulting in coronal heating.