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Global Behaviors for Dynamics of Flaring Loops

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Solar Flare Loops: Observations and Interpretations

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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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Authors and Affiliations

  1. Purple Mountain Observatory, Nanjing, China

    Guangli Huang, Haisheng Ji & Zongjun Ning

  2. Pulkovo Observatory, Russian Academy of Sciences, Saint-Petersburg, Russia

    Victor F. Melnikov

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  1. Guangli Huang
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Huang, G., Melnikov, V.F., Ji, H., Ning, Z. (2018). Global Behaviors for Dynamics of Flaring Loops. In: Solar Flare Loops: Observations and Interpretations. Springer, Singapore. https://doi.org/10.1007/978-981-10-2869-4_7

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