WHY IS THE GREAT SOLAR ACTIVE REGION 12192 FLARE-RICH BUT CME-POOR?
WHY IS THE GREAT SOLAR ACTIVE REGION 12192 FLARE-RICH BUT CME-POOR?
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DOI：
10.1088/2041-8205/804/2/l28
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发表时间：
2015-02
期刊：
影响因子：
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通讯作者：
Xudong Sun;M. Bobra;J. Hoeksema;Yang Liu;Yan Li;C. Shen;S. Couvidat;A. Norton;G. Fisher
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文献类型：
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作者：
Xudong Sun;M. Bobra;J. Hoeksema;Yang Liu;Yan Li;C. Shen;S. Couvidat;A. Norton;G. Fisher
2014年10月的太阳活动区(AR)12192拥有24年来最大的太阳黑子群。它是到目前为止第24周最多的耀斑地点，但令人惊讶的是，在其圆盘通过期间，没有从核心区域产生日冕物质抛射(CME)。在这里，我们研究防止喷发的磁性条件以及随之而来的后果。我们发现AR 12192是“大而弱”的；与另外两个产生耀斑的耀斑(11429和11158)相比，它的核心区表现出较弱的非位势、较强的上覆场和较小的耀斑相关的场变化。这些差异存在于集约型指数(例如，平均值)，但通常不存在于粗放型指数(例如，总计)。AR 12192‘S的大量磁性自由能并没有转化为CME生产率。这一意想不到的行为表明，AR爆发受到背景场限制下的磁非势能的某种相对度量的限制，与喷发的耀斑相比，受限耀斑可能会留下更弱的光球和日冕印记。
Solar active region (AR) 12192 of 2014 October hosts the largest sunspot group in 24 years. It is the most prolific flaring site of Cycle 24 so far, but surprisingly produced no coronal mass ejection (CME) from the core region during its disk passage. Here, we study the magnetic conditions that prevented eruption and the consequences that ensued. We find AR 12192 to be “big but mild”; its core region exhibits weaker non-potentiality, stronger overlying field, and smaller flare-related field changes compared to two other major flare-CME-productive ARs (11429 and 11158). These differences are present in the intensive-type indices (e.g., means) but generally not the extensive ones (e.g., totals). AR 12192's large amount of magnetic free energy does not translate into CME productivity. The unexpected behavior suggests that AR eruptiveness is limited by some relative measure of magnetic non-potentiality over the restriction of background field, and that confined flares may leave weaker photospheric and coronal imprints compared to their eruptive counterparts.