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arXiv 1003.0308astro-ph.SR
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太阳耀斑发生的时间-能量关联

Time-energy correlations in solar flare occurrence

Eugenio Lippiello, Lucilla de Arcangelis, Cataldo Godano

摘要:

耀斑发生是否存在时间-能量相关仍然是一个开放的和有争议的问题。这项研究解决了一个问题,即连续耀斑的能量以及能量和等待时间之间是否存在统计上显着的相关性。我们分析的GOES目录与统计方法的基础上比较的真正的目录与重新洗牌的能量是去相关的。这种分析减少了背景活动的影响,并能够揭示遮蔽的作用。我们证明了等待时间和能量之间以及随后的耀斑能量之间存在非平凡的相关性。更准确地说,我们发现耀斑在时间上接近往往有第二个事件与大能量。此外,在大耀斑之后,耀斑速率显著增加,同时也增加了其他大耀斑的概率。结果表明,能量和等待时间之间的相关性是一个物理属性,而不是一个模糊的效果。这些发现可以为太阳日冕中能量储存和释放的机制提供重要信息。

英文摘要:

The existence of time-energy correlations in flare occurrence is still an open and much debated problem. This study addresses the question whether statistically significant correlations are present between energies of successive flares as well as energies and waiting times. We analyze the GOES catalog with a statistical approach based on the comparison of the real catalog with a reshuffled one where energies are decorrelated. This analysis reduces the effect of background activity and is able to reveal the role of obscuration. We show the existence of non-trivial correlations between waiting times and energies, as well as between energies of subsequent flares. More precisely, we find that flares close in time tend to have the second event with large energy. Moreover, after large flares the flaring rate significantly increases, together with the probability of other large flares. Results suggest that correlations between energies and waiting times are a physical property and not an effect of obscuration. These findings could give important information on the mechanisms for energy storage and release in the solar corona.

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