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Dynamical Features and Evolutional Characteristics of Brightening Coronal Loops

机译:冠状冠增亮的动力学特征和演化特征

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摘要

We present a detailed study of coronal loop brightenings observed in an active region on the solar limb. These brightening loops show expanding and shrinking motions in EUV coronal line images and also show downflow along the loops in Lα and Hα images. By means of time-slice analysis of the images, we found that both the expanding and shrinking motions of the loops are not real motions of plasma but apparent motions like post-flare loops, where the loops at the different height are successively heated and cooled. From a temperature analysis, the time delay between the brightenings of hot 195 Å and cool Lα loops is found to be nearly equal to the time-scale of the conduction cooling. We conclude that these loop brightenings are sources of so called Hα coronal rains.
机译:我们提出了在太阳肢体活动区域观察到的冠状冠增亮的详细研究。这些增亮环在EUV冠状线图像中显示了扩展和收缩运动,并且还显示了沿Lα和Hα图像中的环向下流动。通过对图像进行时间切片分析,我们发现环的膨胀和收缩运动都不是等离子的真实运动,而是类似耀斑后环的明显运动,其中在不同高度的环被连续加热和冷却。通过温度分析,发现热195Å和冷Lα回路的增亮之间的时间延迟几乎等于传导冷却的时间尺度。我们得出的结论是,这些环状增亮是所谓的Hα日冕雨的来源。

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  • 来源
    《Solar Physics》 |2002年第1期|133-142|共10页
  • 作者单位

    Nobeyama Radio Observatory National Astronomical Observatory;

    Kwasan and Hida Observatories Kyoto University;

    The Institute of Space and Astronautical Science;

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  • 正文语种 eng
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