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arXiv 2601.03354astro-ph.SRphysics.plasm-ph
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极端紫外线合成纳米喷射-like喷射由于相互融合的磁通绳

Extreme-ultraviolet synthesis of nanojet-like ejections due to coalescing flux ropes

Instituto de Astrofísica de Canarias（加那利天体物理研究所）；Universidad de La Laguna（拉古纳大学）；Institut de Recherche en Astrophysique et Planétologie（天体物理学与行星学研究所在）；SETI Institute（SETI研究所）；Lockheed Martin Solar and Astrophysics Laboratory（洛马太阳与天体物理实验室）；Institute of Theoretical Astrophysics, University of Oslo（奥斯陆大学理论天体物理研究所）；Rosseland Centre for Solar Physics, University of Oslo（奥斯陆大学罗斯兰太阳物理中心）；School of Engineering, Physics, and Mathematics, Northumbria University（诺森比亚大学工程、物理与数学学院）

Samrat Sen, A. Ramada C. Sukarmadji, D. Nóbrega-Siverio, F. Moreno-Insertis, J. Martínez-Sykora, Patrick Antolin

备注：
Accepted for publication in the ApJ Letter. The animations associated with Figures 1 and 2 are available from the corresponding author upon reasonable request. The code used for the synthetic imaging and spectra is also available from the corresponding author upon reasonable request
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AI总结：

本文通过数值模拟展示了磁通绳融合产生纳米喷射的三维场景，利用MPI-AMRVAC代码预测了极紫外线观测特征，为未来观测提供了诊断方法。

摘要：

检测和表征如纳米闪焰和纳米喷射这样的小尺度高能事件仍然具有挑战性，因为它们寿命短、空间范围小且释放的能量相对较低，尽管它们在日冕加热中可能起重要作用。最近的观测结果已经识别出纳米喷射作为小尺度（长度≈6.6 Mm，宽度≈1 Mm），快速（≈几100 km/s），短寿命（≈30秒）的喷射，与纳米闪焰尺度的能量相关，提供了磁重联在小空间尺度上的证据。然而，缺乏合成诊断限制了磁流体动力学（MHD）模型与观测之间的联系。在本信中，我们展示了两个磁通绳的合成观测，导致数值模型中获得的纳米喷射-like特征，使用MPI-AMRVAC代码。我们报告了与现有仪器如SDO/AIA以及即将进行的MUSE任务兼容的极紫外线线合成观测，并将合成观测与现有纳米喷射观测进行比较。合成诊断的发射率图、多普勒速度、热和非热线展宽产生关键观测属性，表明纳米喷射生成的可能三维场景，其中小磁通绳在回路中重联。我们的结果为当前和未来光谱观测设施检测纳米喷射提供了预测，并建立了MHD建模与观测之间的桥梁。

英文摘要：

Detection and characterization of small-scale energetic events such as nanoflares and nanojets remain challenging owing to their short lifetimes, small spatial extent, and relatively low energy release, despite their potential role in coronal heating. Recent observations have identified nanojets as small-scale (length $\lesssim 6.6$~Mm, width $\lesssim 1$~Mm), fast ($\sim$~few 100 km s$^{-1}$), and short-lived ($\lesssim 30$~s) ejections associated with nanoflare-scale energies, providing evidence of magnetic reconnection at small spatial scales. However, the lack of synthetic diagnostics has limited the connection between magnetohydrodynamic (MHD) models and observations. In this Letter, we present synthetic observations of the coalescence of two flux ropes, leading to nanojet-like signatures from a numerical model obtained with the \texttt{MPI-AMRVAC} code. We report synthetic observables in Extreme-ultraviolet lines compatible with existing instruments such as SDO/AIA, and upcoming MUSE mission, and compare the synthetic observables with an existing observation of nanojets. The synthetic diagnostics of the emissivity maps, Doppler velocity, thermal, and non-thermal line broadening produce key observational properties, suggesting a plausible 3D scenario for nanojet generation where tiny flux ropes reconnect within loops. Our results provide predictions for the detectability of nanojets with current and future spectroscopic facilities, and establish a bridge between MHD modeling and observations.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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