作为太阳辐射焦点的电离层扰动的直接观测：光谱焦散
Direct Observations of Traveling Ionospheric Disturbances as Focusers of Solar Radiation: Spectral Caustics
摘要：
太阳辐射聚焦效应与太阳发射的高频和甚高频电波在地球电离层中传播的特殊现象有关。这一自然效应是通过在10-200兆赫范围内运行的地面无线电仪器观测到的，作为太阳动态光谱上的独特图案-光谱焦散线。有人认为，SC与中等规模的电离层扰动（MSTIDS）。在本文中，我们提出了第一次直接观测的SC引起的MSTIDS，使用太阳动力学光谱与SC获得不同的欧洲射电望远镜在2014年1月8日和同时二维去趋势总电子含量（dTEC）地图在欧洲。dTEC地图的空间检查，以及精确的时间分析的地图和动态光谱已经进行。首先，我们发现了几对一对一（TID-SC）的对应关系。该研究提供了强有力的观察证据，支持MSTID是SC的原因的建议。
英文摘要：
The solar radiation focusing effect is related to the specific phenomenon of propagation of the Sun-emitted HF and VHF waves through terrestrial ionosphere. This natural effect is observed with ground-based radio instruments running within 10-200 MHz range, as distinctive patterns - the Spectral Caustics (SCs) - on the solar dynamic spectra. It has been suggested that SCs are associated with medium-scale traveling ionospheric disturbances (MSTIDs). In this paper, we present the first direct observations of SCs induced by MSTIDs, using solar dynamic spectra with SCs obtained by different European radio telescopes on January 8, 2014 and simultaneous two-dimensional detrended total electron content (dTEC) maps over Europe. Spatial examination of dTEC maps as well as precise timing analysis of the maps and the dynamic spectra have been performed. First, we found several pairs of one-to-one (TID-SC) correspondences. The study provides strong observational evidence supporting the suggestion that MSTIDs are the cause of SCs.
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