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Global Behaviors for Dynamics of Flaring Loops

  • Guangli HuangEmail author
  • Victor F. Melnikov
  • Haisheng Ji
  • Zongjun Ning
Chapter
  • 245 Downloads

Abstract

Solar flares are explosive phenomena produced by sudden release of free magnetic energy. It is generally believed that flare loops, especially those of two-ribbon flares, show continuous expansion motions during their eruption. Meanwhile, flare ribbons separate continuously in space from each other. Such observational phenomena are interpreted in theory by continuously rising of the magnetic reconnection site, which closely follows erupting magnetic flux ropes (or filaments). However, results based on a statistical study with Yohkoh HXR Telescope data indicate that FPs in only 13% of the flares show standard separation motion (Bogachev et al. Astrophys J 630:561–572, 2005, [1]), while in more flares they show motions parallel to bright flare ribbons, even with tendency to converge. Using high-cadence time sequence of observations for the M1.2 class flare on September 9, 2002, at Big Bear Solar Observatory (BBSO), Ji et al. (Astrophys J 607:L55–L58, 2004, [2]) found that the distance between H\(_\alpha \) kernels decreases at the rising phase of the flare, it increases only after the peak time. At the same time, the height of the LT X-ray source of the flare decreases at first, and increases after the maximum phase. From Fig. A.12 in Appendix A, we can see that the time profiles of the flare emission, the distance between bright kernels, and the height of the loop top X-ray source show a good correlation or anti-correlation not only as a whole but also in some details.

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Copyright information

© Science Press, Beijing and Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Guangli Huang
    • 1
    Email author
  • Victor F. Melnikov
    • 2
  • Haisheng Ji
    • 1
  • Zongjun Ning
    • 1
  1. 1.Purple Mountain ObservatoryNanjingChina
  2. 2.Pulkovo ObservatoryRussian Academy of SciencesSaint-PetersburgRussia

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