Abstract—

A statistical study of long-duration (long-duration event, LDE) flares in the soft X-ray (SXR) range for solar cycles 23 and 24 is carried out. Graphs of the dependence of the strength of LDE flares and coronal mass ejections (CMEs) on the duration of these flares are constructed. As a result, we find that a significant proportion of LDE flares is not associated with large mass CMEs. This contradicts the hypothesis that the energy required to maintain the post-eruptive phase of LDE flares is supplied by the energy of settling matter after CME eruption. However, most flares are accompanied by mini-eruptions, which may have a significance in the energy balance of LDEs. The diagram of the strength–duration of flares shows that there is a limit of energy and maximum strength of an LDE flare in the SXR range in LDE events. Apparently, this limit differs for cycles 23 and 24. This fact may indicate that there is a limit to the maximum flare energy that can be observed in a particular solar cycle.

中文翻译：

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太阳周期23和24中长时耀斑及相关的色球和冠冕射出的研究

摘要—

对太阳周期23和24的软X射线（SXR）范围内的持续时间（持续时间事件，LDE）耀斑进行了统计研究。绘制了LDE耀斑强度和日冕物质抛射（CME）强度与这些耀斑持续时间的关系图。结果，我们发现很大比例的LDE耀斑与大规模CME无关。这与这样的假设相矛盾，即维持LDE耀斑爆发后阶段所需的能量是由CME爆发后沉降物质的能量提供的。但是，大多数耀斑伴随着小爆发，这可能对LDE的能量平衡具有重要意义。耀斑的强度-持续时间图表明，在LDE事件中，SXR范围内的LDE耀斑具有能量极限和最大强度。显然，