论文标题
太阳型IIIB无线电爆发的精细结构的Lofar遥控基线的干涉成像
Interferometric Imaging with LOFAR Remote Baselines of the Fine Structures of a Solar Type IIIb Radio Burst
论文作者
论文摘要
语境。太阳能无线电爆发主要来自太阳爆发等太阳耀斑，喷气式飞机和冠状质量弹出的高能电子。太阳能无线电爆发的子类别可以用作理解电晕内的波产生和传播的代理。目标。由于工具性的限制，对短期爆发的源大小，位置和运动学的完整案例研究非常罕见。通过太阳能IIIB-III对的明确例子进行了全面的多频谱和成像研究。方法。在这项工作中，使用低频阵列（Lofar）的远程基线以干涉模式成像无线电爆发的来源。对频谱和带有成像的无线电源运动中的精细结构进行了详细分析。结果。该研究表明了基本组件和谐波成分如何具有明显不同的源运动。 26.56MHz基本发射的明显来源以光速的4倍远离太阳能磁盘中心，而相同频率的谐波发射的明显来源显示速度<0.02c。在这种情况下观察到的谐波排放的源大小比以前的研究小，表明使用遥控基线的重要性。
Context. Solar radio bursts originate mainly from high energy electrons accelerated in solar eruptions like solar flares, jets, and coronal mass ejections. A subcategory of solar radio bursts with short time duration may be used as a proxy to understand the wave generation and propagation within the corona. Aims. Complete case studies of the source size, position and kinematics of short term bursts are very rare due to instrumental limitations. A comprehensive multi-frequency spectroscopic and imaging study was carried out of a clear example of a solar type IIIb-III pair. Methods. In this work, the source of the radio burst was imaged with the interferometric mode, using the remote baselines of the LOw Frequency ARray (LOFAR). A detailed analysis of the fine structures in the spectrum and of the radio source motion with imaging was conducted. Results. The study shows how the fundamental and harmonic components have a significantly different source motion. The apparent source of the fundamental emission at 26.56MHz displaces away from the solar disk center at about 4 times the speed of light, while the apparent source of the harmonic emission at the same frequency shows a speed of < 0.02c. The source size of the harmonic emission, observed in this case, is smaller than that in previous studies, indicating the importance of the use of the remote baselines.
