距离耀斑站点500 $''$的分米制发射：来自${\textit{GMRT}}$太阳射电观测的可能方案
Decimetric emission 500$''$ away from a flaring Site: Possible scenarios from ${\textit{GMRT}}$ solar radio observations
摘要：
我们提出了一项分米波射电活动的研究，使用610 MHz的${\textit{Giant Meterwave Radio Telescope}}$（${\textit{GMRT}}$）的第一个高时间节奏（0.5 s）图像，与${\textit{GOES}}$ C1.4和M1.0级太阳耀斑，以及2015年6月20日发生的日冕物质抛射（CME）爆发有关。来自${\textit{GMRT}}$的高空间分辨率图像显示，在C1.4耀斑期间有一个强射电源，位于距离耀斑地点约500 $''$的地方，附近没有相应的明亮足迹或日冕特征。相反，在M1.0耀斑期间和CME开始时，在耀斑附近发现了强射电源。在C1.4耀斑活动最大期，在耀斑爆发点附近也发现了弱射电源，这与云南天文台太阳宽带射电频谱仪所发现的米波III型爆发有时间上的联系。基于多波长分析和磁位场源表面外推，我们认为${\textit{GMRT}}$射电源和度规III型爆发的源电子起源于一个共同的电子加速场.强${\textit{GMRT}}$射电源是由相干发射过程产生的，其视位置远离耀斑现场可能是由于波导效应。
英文摘要：
We present a study of decimetric radio activity, using the first high time cadence (0.5 s) images from the ${\textit{Giant Meterwave Radio Telescope}}$ (${\textit{GMRT}}$) at 610 MHz, associated with ${\textit{GOES}}$ C1.4 and M1.0 class solar flares, and a coronal mass ejection (CME) onset that occurred on 20 June 2015. The high spatial resolution images from ${\textit{GMRT}}$ show a strong radio source during the C1.4 flare, located ~500$''$ away from the flaring site with no corresponding bright footpoints or coronal features nearby. In contrast, however, strong radio sources are found near the flaring site during the M1.0 flare and around the CME onset time. Weak radio sources, located near the flaring site, are also found during the maximum of the C1.4 flare activity, which show a temporal association with metric type III bursts identified by the Solar Broadband Radio Spectrometer at Yunnan Astronomical Observatory. Based on a multi-wavelength analysis and magnetic potential field source surface extrapolations, we suggest that the source electrons of ${\textit{GMRT}}$ radio sources and metric type III bursts were originated from a common electron acceleration site. We also show that the strong ${\textit{GMRT}}$ radio source is generated by a coherent emission process and its apparent location far from the flaring site is possibly due to the wave-ducting effect.
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