超活动区的磁演化。复杂性和潜在的不稳定磁不连续性
Magnetic evolution of superactive regions. Complexity and potentially unstable magnetic discontinuities
摘要：
在这项工作中，我们已经研究了超活动区域的样本的一些属性的时间演化，目的是挑选出最重要的耀斑活动预测。我们研究了2000年1月1日至2006年12月31日期间用MDI/SOHO仪器观测到的14个超活动区的性质，这些超活动区的特征是在它们通过太阳盘期间特别强烈的耀斑活动。本文分析了光球磁场的分形和多重分形性质的时间演化，即广义分维和分维与维数的变化，以及所研究的光球上方磁不连续性的潜在不稳定体积。还估计了这些量与耀斑指数的相关性，耀斑指数提供了关于一个区域的耀斑活动的信息。我们发现在50%的样本中，广义分维与在50小时窗口内计算的耀斑指数相关，而贡献多样性和维数多样性与同一指数相关。在日冕中的磁不连续的潜在不稳定体积的增加被观察到之前的阶段，其特征在于更频繁和更强烈的耀斑。我们还发现，自由能分布函数的不稳定体积的分析超活性区可以拟合直线的斜率大于在以前的作品中发现的值为不太活跃的磁性区域。广义分形维数和潜在的不稳定体积的磁不连续性是最适合的统计调查与耀斑活动的关系在较长的时间间隔（50小时）和较短的时间间隔（几个小时），分别。
英文摘要：
In this work, we have studied the temporal evolution of some properties of a sample of superactive regions with the aim to single out the most significant for flare activity forecasting. We have investigated properties of 14 superactive regions, observed between January 1st 2000 and December 31st 2006 with MDI/SOHO instrument and characterized by a particularly intense flare activity during their passage on the solar disk. We have analyzed the temporal evolution of fractal and multifractal properties of photospheric magnetic fields, namely the generalized fractal dimension and the cntribution and dimensionality diversities, as well as the potential unstable volumes of magnetic discontinuities above the studied ARs. Correlations of these quantities with the flare index, which provides information about the flare activity of a region, have also been estimated. We found that in 50 % of our sample the generalized fractal dimension is correlated with the flare index computed over windows of 50 hours, while the contribution diversity and the dimensional diversity are anticorrelated with the same index. An increase of the potential unstable volume of magnetic discontinuities in the corona is observed before the phases characterized by more frequent and intense flares. We also found that the free energy distribution functions of unstable volumes of the analyzed superactive regions can be fitted with straight lines whose slope is larger than the values found in previous works for less active magnetic regions. The generalized fractal dimension and the potential unstable volume of magnetic discontinuities are the most suitable for statistical investigations of relations with flare activity over longer (50 hours) and shorter (few hours) time intervals, respectively.
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