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arXiv 2401.07982astro-ph.SR
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太阳耀斑中非热速度与自由磁能之间的联系

The Link Between Non-Thermal Velocity and Free Magnetic Energy in Solar Flares

James McKevitt, Robert Jarolim, Sarah Matthews, Deborah Baker, Manuela Temmer, Astrid Veronig, Hamish Reid, Lucie Green

AI总结:

研究结合Hinode/EIS光谱观测与HMI磁图的NLFFF外推,发现两次X级耀斑中非热速度与自由磁能在短时间尺度上呈反比,表明非热展宽更可能受Alfvén波和湍流影响。

摘要:

过量谱线展宽(非热速度)的成因尚未得到明确认识,但鉴于其在耀斑发生前和发生期间均会升高,相关因果过程为理解重联开始的触发因素以及日冕磁场中自由磁能的释放提供了线索。对 Hinode 航天器上极紫外(EUV)成像光谱仪(EIS)在9小时期间以3分钟采样率获得的数据,与基于日震与磁成像仪(HMI)磁图、以12分钟采样率进行的非线性无力场(NLFFF)外推结果进行比较,显示在2017年9月6日两次X级太阳耀斑期间,短时间尺度上的非热速度与自由磁能之间存在反比关系。对这些结果的分析支持如下观点:未分辨的多普勒流并非非热展宽的唯一成因,相反,Alfvén波传播和各向同性湍流等其他机制具有更大影响。

英文摘要:

The cause of excess spectral line broadening (non-thermal velocity) is not definitively known, but given its rise before and during flaring, the causal processes hold clues to understanding the triggers for the onset of reconnection and the release of free magnetic energy from the coronal magnetic field. A comparison of data during a 9-hour period from the extreme ultraviolet (EUV) Imaging Spectrometer (EIS) on the Hinode spacecraft - at a 3-minute cadence - and non-linear force-free field (NLFFF) extrapolations performed on Helioseismic and Magnetic Imager (HMI) magnetograms - at a 12-minute cadence - shows an inverse relationship between non-thermal velocity and free magnetic energy on short timescales during two X-class solar flares on 6 September 2017. Analysis of these results supports suggestions that unresolved Doppler flows do not solely cause non-thermal broadening and instead other mechanisms like Alfvén wave propagation and isotropic turbulence have a greater influence.

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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