Peculiar Features in the Solar Coronal Hole Occurrence

Mirjam Y. Hofer; Marisa Storini

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Peculiar Features in the Solar Coronal Hole Occurrence

机译：太阳日冕孔发生中的特殊特征

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A good knowledge of coronal hole (CH) evolution in time is relevant for the understanding of the decay and/or the stability of large-scale magnetic fields in the different heliographic latitudinal belts. Using a CH catalogue, mainly compiled from the He i line (10830 Å) measurements (Sanchez-Ibarra and Barraza-Paredes, 1992, and updated from the NOAA/Boulder Web pages), some characteristics of the CH behaviour in the solar activity cycles 21 and 22 are identified and described. We found: (i) the total number distributions for the isolated and polar coronal holes are similar, (ii) there is a north/south asymmetry, with a northern dominance in the number distribution of the polar coronal holes, (iii) a hint of a 22-year periodicity in the CH behaviour. In addition, two pairs of two isolated CHs with opposite polarity, maximum ages of more than 14 Carrington rotations, separated by about two years, are found during the early decreasing activity phase of each cycle.

机译：正确了解冠状孔（CH）的时间演变与理解不同的纬度纬度带中大范围磁场的衰减和/或稳定性有关。使用主要根据He i线（10830Å）测量值编制的CH目录（Sanchez-Ibarra和Barraza-Paredes，1992，并从NOAA / Boulder Web页更新），得出太阳活动周期中CH行为的一些特征识别并描述图21和22。我们发现：（i）孤立和极地日冕孔的总数分布相似，（ii）南北不对称，极地日冕孔的数量分布以北方为主，（iii）提示CH行为的22年周期。此外，在每个周期的早期活动减少阶段，发现了两对极性相反的两个独立的CH，最长寿命超过14次Carrington旋转，相隔约两年。

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《Solar Physics》 |2002年第1期|1-10|共10页
作者
Mirjam Y. Hofer; Marisa Storini;
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IFSI/CNR;

IFSI/CNRRAGGI COSMICI - UNIRomaTre;

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Peculiar Features in the Solar Coronal Hole Occurrence

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