标题： 2013年5月31日观测到的复杂十米型II爆发现象的空间特性 显示英文标题

标题： Spatial properties of the complex decameter type II burst observed on 31 May 2013

摘要： 我们展示了与窄地面对应CME相关的复杂强大II型爆发的观测结果，该CME于2013年5月31日UT大约11时抛射。 观测由无线电望远镜UTR-2进行，它作为局部干涉仪运行，提供了检测无线电辐射源的空间参数的可能性。 还有来自URAN-2无线电望远镜的偏振数据。 CME被两个空间日冕仪SOHO/LASCO/C2和STEREO/COR1-BEHIND探测到，并且对于STEREO-AHEAD航天器来说完全不可见。 相关II型爆发由动态频谱上两个外观截然不同的连续部分组成。 第一个爆发频率范围窄，具有云状结构并且完全没有偏振，而第二个爆发则表现出丰富的锯齿状结构并显示出高程度的圆偏振。 整个事件的两个部分都显示带分裂并且有明显区分的谐波结构。 使用干涉仪基线的互相关函数找到了II型爆发源的位置和大小。 II型爆发元素的源平均约为15角分，最小的达到10角分。 相应的亮度温度被估算出来。 在大多数情况下，这些温度介于$10^{11}$和$10^{12}$K之间，最大值高达$10^{14}$K。 测量了源的空间位移并确定了II型爆发源的模型无关速度。 显示英文摘要

摘要： We present the results of observations of complex powerful type II burst associated with narrow Earth-directed CME, which was ejected at around 11 UT on 31 May 2013. The observations were performed by radio telescope UTR-2, which operated as local interferometer, providing the possibility of detection of the spatial parameters of the radio emission source. There are also polarization data from URAN-2 radio telescope. The CME was detected by two space-born coronagraphs SOHO/LASCO/C2 and STEREO/COR1-BEHIND, and was absolutely invisible for STEREO-AHEAD spacecraft. The associated type II burst consisted of two successive parts of quite different appearance on the dynamic spectrum. The first burst was narrow in frequency, had cloudy structure and was completely unpolarized while the second one represented rich herring-bone structure and exposed high degree of circular polarization. Both parts of the whole event reveal band splitting and well distinguished harmonic structure. The positions and sizes of the sources of the type II burst were found using cross-correlation functions of interferometer bases. The sources of the type II bursts elements were found to be of about 15 arcmin in size in average, with the smallest ones reaching as low as 10 arcmin. Corresponding brightness temperatures were estimated. In most cases these temperatures were between $10^{11}$ and $10^{12}$ K with maximum value as high as $10^{14}$ K. The spatial displacement of the source was measured and model independent velocities of the type II burst sources were determined.