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arXiv 2212.02147astro-ph.SR
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U型射电爆发的三维重建:一种新的日冕环遥感方法

Three-dimensional reconstruction of type U radio bursts: a novel remote sensing approach for coronal loops

S. Mancuso, D. Barghini, A. Bemporad, D. Telloni, D. Gardiol, F. Frassati, I. Bizzarri, C. Taricco

摘要:

U型射电爆发是太阳产生的脉冲相干射电辐射,表明存在沿日冕中磁环传播的次相对论电子束。在这项工作中,我们提出了一个U型无线电爆发的分析,异常成像2011年3月22日由Nançay射电日像仪(NRH)在三个不同的频率(298.7,327.0,和360.8 MHz)。使用一种新的建模方法,我们首次表明,使用高分辨率射电日像仪图像的U型射电爆发可以是足够的,既准确地重建冠状环的三维形态(而无需重复三角测量技术),并充分约束其物理参数。与此同时,我们可以获得关于加速电子束动力学的独特信息,这为加速电子束的等离子体机制以及为什么U型射电暴没有像III型射电暴那样频繁地被观察到提供了重要线索。最后,我们提出了一个有问题的方面有关的明显缺乏联系的建模环推断从无线电图像和极紫外线(EUV)结构从太空中观察到的同一日冕区域

英文摘要:

Type U radio bursts are impulsive coherent radio emissions produced by the Sun that indicate the presence of subrelativistic electron beams propagating along magnetic loops in the solar corona. In this work, we present the analysis of a type U radio burst that was exceptionally imaged on 2011 March 22 by the Nançay Radioheliograph (NRH) at three different frequencies (298.7, 327.0, and 360.8 MHz). Using a novel modelling approach, we show for the first time that the use of high-resolution radio heliograph images of type U radio bursts can be sufficient to both accurately reconstruct the 3D morphology of coronal loops (without recurring to triangulation techniques) and to fully constrain their physical parameters. At the same time, we can obtain unique information on the dynamics of the accelerated electron beams, which provides important clues as to the plasma mechanisms involved in their acceleration and as to why type U radio bursts are not observed as frequently as type III radio bursts. We finally present plausible explanations for a problematic aspect related to the apparent lack of association between the modeled loop as inferred from radio images and the extreme-ultraviolet (EUV) structures observed from space in the same coronal region

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