利用LOFAR远距离基线对太阳IIIb型射电爆发精细结构的干涉成像
Interferometric Imaging with LOFAR Remote Baselines of the Fine Structures of a Solar Type IIIb Radio Burst
摘要：
上下文太阳射电爆发主要起源于太阳耀斑、喷流和日冕物质抛射等太阳爆发中加速的高能电子。短时间太阳射电爆发的一个子类可以用来作为理解日冕内波的产生和传播的代理。目标。由于仪器的限制，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。对太阳IIIb-III型对的一个明显例子进行了全面的多频率光谱和成像研究。方法.利用低频阵（LOFAR）的远程基线，对射电爆发源进行了干涉成像。对频谱中的精细结构和射电源运动与成像进行了详细分析。结果研究表明，基波和谐波分量具有显着不同的源运动。26.56MHz基频辐射的视源以约4倍光速的速度远离太阳盘面中心，而相同频率的谐波辐射的视源显示出小于0.02c的速度。在这种情况下，观察到的谐波发射的源的大小比以前的研究中的小，这表明使用远程基线的重要性。
英文摘要：
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.
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。
