标题： 喷发太阳活动区中喷流事件的磁螺旋度和能量收支 显示英文标题

标题： Magnetic helicity and energy budgets of jet events from an emerging solar active region

摘要： 使用由太阳动力学天文台上的日震和磁成像仪获得的光球矢量磁图以及基于磁连通性的方法，我们在磁通量浮现阶段计算了一个简单双极太阳活动区（AR）的磁螺旋度和自由磁能预算，该阶段持续了$\sim$47 小时。 该AR没有产生任何日冕物质抛射（CMEs）或X射线等级高于C1.0的耀斑，但在其通量浮现阶段是60次喷流事件的发生地。 在我们研究的整个时间段内，该AR的螺旋度和自由能预算均低于已建立的爆发相关阈值。 然而，除了缓慢变化的演化外，螺旋度和自由能预算的时间轮廓还显示出离散的局部峰值，其中八对峰值出现在从AR发出喷流的时间。 这些喷流具有比AR其他喷流更大的基底面积和更长的持续时间。 我们首次估计了与这八次喷流相关的螺旋度和自由磁能变化，分别在$0.5-7.1 \times 10^{40}$ Mx$^2$和$1.1-6.9 \times 10^{29}$ erg 的范围内。 尽管这些数值比通常与CMEs相关的数值小一到两个数量级，但相关的百分比变化是显著的，标准化螺旋度的变化范围为13%至76%，标准化自由磁能的变化范围为9%至57%。 我们的研究表明，偶尔喷流可能在新兴活动区的螺旋度和自由磁能预算的演化中留下显著的痕迹。 显示英文摘要

摘要： Using photospheric vector magnetograms obtained by the Helioseismic and Magnetic Imager on board the Solar Dynamic Observatory and a magnetic connectivity-based method, we compute the magnetic helicity and free magnetic energy budgets of a simple bipolar solar active region (AR) during its magnetic flux emergence phase which lasted $\sim$47 hrs. The AR did not produce any coronal mass ejections (CMEs) or flares with an X-ray class above C1.0 but it was the site of 60 jet events during its flux emergence phase. The helicity and free energy budgets of the AR were below established eruption-related thresholds throughout the interval we studied. However, in addition to their slowly-varying evolution, each of the time profiles of the helicity and free energy budgets showed discrete localized peaks, with eight pairs of them occurring at times of jets emanating from the AR. These jets featured larger base areas and longer durations than the other jets of the AR. We estimated, for the first time, the helicity and free magnetic energy changes associated with these eight jets which were in the ranges of $0.5-7.1 \times 10^{40}$ Mx$^2$ and $1.1-6.9 \times 10^{29}$ erg, respectively. Although these values are one to two orders of magnitude smaller than those usually associated with CMEs, the relevant percentage changes were significant and ranged from 13% to 76% for the normalized helicity and from 9% to 57% for the normalized free magnetic energy. Our study indicates that occasionally jets may have a significant imprint in the evolution of helicity and free magnetic energy budgets of emerging active regions.