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arXiv 2007.08127astro-ph.SR
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大太阳耀斑爆发特征的活动区磁通量

Magnetic Flux of Active Regions Determining the Eruptive Character of Large Solar Flares

Ting Li, Yijun Hou, Shuhong Yang, Jun Zhang, Lijuan Liu, Astrid M. Veronig

摘要:

我们建立了迄今为止最大的爆发/局限耀斑数据库,并分析了2010年$-$ 2019年期间发生的322次\emph{GOES} M1.0级及以上耀斑,即,几乎跨越了整个太阳活动周期研究发现,活动区总无符号磁通量($Φ$ $_{AR}$)是控制大耀斑爆发特征的一个关键参数,大耀斑爆发的比例与$Φ$ $_{AR}$具有很强的反相关性.这意味着,含有大磁通量的AR产生的大耀斑与日冕物质抛射(CME)相关的概率较低。这一发现得到了我们获得的临界衰变指数高度和$Φ$ $_{AR}$之间的高度正相关性的支持,这意味着具有较大$Φ$ $_{AR}$的AR具有较强的磁约束。此外,起源于大于1.0 $\times$ $10^{23}$ Mx的AR的受限耀斑具有几个共同的特征:稳定的暗条、滑动的磁重联和强烈剪切的耀斑后环。我们的研究结果揭示了新的关系之间的磁通量的AR和发生的CME与大耀斑。这些关系为预测日冕物质抛射和不利空间天气提供了定量判据,对太阳型恒星和恒星日冕物质抛射的“超级耀斑”也有重要意义。数据库的链接是https://doi.org/10.12149/101030。

英文摘要:

We establish the largest eruptive/confined flare database to date and analyze 322 flares of \emph{GOES} class M1.0 and larger that occurred during 2010$-$2019, i.e., almost spanning the entire solar cycle 24. We find that the total unsigned magnetic flux ($Φ$$_{AR}$) of active regions (ARs) is a key parameter in governing the eruptive character of large flares, with the proportion of eruptive flares exhibiting a strong anti-correlation with $Φ$$_{AR}$. This means that an AR containing a large magnetic flux has a lower probability for the large flares it produces to be associated with a coronal mass ejection (CME). This finding is supported by the high positive correlation we obtained between the critical decay index height and $Φ$$_{AR}$, implying that ARs with a larger $Φ$$_{AR}$ have a stronger magnetic confinement. Moreover, the confined flares originating from ARs larger than 1.0$\times$$10^{23}$ Mx have several characteristics in common: stable filament, slipping magnetic reconnection and strongly sheared post-flare loops. Our findings reveal new relations between the magnetic flux of ARs and the occurrence of CMEs in association with large flares. These relations obtained here provide quantitative criteria for forecasting CMEs and adverse space weather, and have also important implications for "superflares" on solar-type stars and stellar CMEs. The link of database is https://doi.org/10.12149/101030.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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