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arXiv 2603.28601astro-ph.SR
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小尺度脉冲EUV发射增强沿网络回路

Small-scale impulsive EUV emission enhancements along network loops

Max Planck Institute for Solar System Research(马克斯·普朗克太阳系统研究所);Institute for Solar Physics (KIS)(太阳物理研究所)

A. Dolliou, H. Peter, S. Mandal, L. P. Chitta, L. Teriaca, Y. Chen, D. Calchetti

AI总结:

研究通过多仪器观测 quiet Sun 区域,发现小尺度脉冲EUV发射增强,分析其平面天空速度和可能的磁驱动因素,揭示热传输或超音速等离子体流及小尺度磁场涌现的物理机制。

摘要:

网络回路是日冕中常见的特征,其能量预算的维持过程仍存争议。本文利用Solar Orbiter/EUI、Solar Orbiter/PHI和IRIS的多仪器观测,研究quiet Sun区域六小时内的动态及可能的磁驱动因素。报告在三个网络回路中检测到小尺度脉冲EUV发射增强,测量其平面天空速度、Doppler速度及可能的磁场涌现。发现四次增强具有瞬时沿回路的高速分量(超过220 km/s),其中两次与PoS速度相关联。IRIS观测到与Doppler速度相关的强度增加。最终发现小尺度(8E16 Mx)混合极性磁场涌现。结论认为高速分量一致于热传输或超音速等离子体流,而低速分量一致于等离子体流。可能的物理成因是磁重联驱动,由回路脚点的光球运动或小尺度磁双极重联引起。

英文摘要:

Network loops are a common feature in the quiet Sun. The physical processes sustaining their energy budget is still under discussion. We rely on a multi-instrumental (Solar Orbiter/EUI, Solar Orbiter/PHI, IRIS) observation of a six hours quiet Sun region to measure the dynamics and the possible magnetic drivers of impulsive EUV emission enhancements along network loops. We report the detection of small-scale impulsive EUV emission enhancements with EUI/HRIEUV in three network loops. We selected four EUV emission enhancements to measure their plane-of-sky velocities in HRIEUV; their Doppler velocities in the line (log Si iv T = 4.8) with IRIS ; their possible relation to small-scale flux emergence and fluctuation in one of the loop footpoint. The plane-of-sky velocities of the four EUV emission enhancements have a component that seem to appear almost instantaneously along the loop (more than 220 km/s) ; and two of them had a co-temporal component with a PoS velocity of up to , starting near one of the loop footpoint. In one case, we measured with IRIS a co-temporal intensity increase in the line associated with Doppler velocities down to and up to along the line of sight. Finally, we found evidence of small-scale (8E16 Mx) mixed polarity field emergence and fluctuation near one of the loop footpoint. We concluded that the fast component on the plane-of-sky are consistent with a thermal transfer or supersonic plasma flows, while the slower component is consistent with plasma flows. A possible physical origin for these EUV emission enhancements would be magnetic reconnection driven by either photospheric motion of the loop footpoints or by the reconnection of the loop with small-scale magnetic bipoles.

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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