论文标题
U型无线电爆发的三维重建：一种新型的冠状环路遥感方法
Three-dimensional reconstruction of type U radio bursts: a novel remote sensing approach for coronal loops
论文作者
论文摘要
U型无线电爆发是太阳产生的冲动相干无线电排放，表明存在沿太阳电晕中磁环传播的亚层次电子束。在这项工作中，我们介绍了Nançay放射射击图（NRH）在2011年3月22日以三种不同频率（298.7、327.0和360.8 MHz）进行异常成像的U型无线电爆发的分析。使用一种新型的建模方法，我们首次展示了使用U型无线电爆发的高分辨率无线电射击图像可以准确地重建冠状环的3D形态（而无需重复出现到三角测量技术）并完全限制其物理参数。同时，我们可以获取有关加速电子束动力学的独特信息，该信息提供了有关其加速度涉及的等离子体机制的重要线索，以及为何不像III型无线电爆发那样频繁地观察到U型无线电爆发。我们最终提出了有关有问题的方面的合理解释，与从无线电图像中推断出的建模循环之间明显缺乏关联有关，而从同一冠状区域中的空间观察到的极端粉丝（EUV）结构（EUV）结构
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
