Solar Prominence Interactions
Solar Prominence Interactions
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DOI：
10.1086/431721
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发表时间：
2005-08
期刊：
影响因子：
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通讯作者：
C. DeVore;S. Antiochos;G. Aulanier
中科院分区：
文献类型：
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作者：
C. DeVore;S. Antiochos;G. Aulanier
我们报告了在剪切拱廊模型中对太阳日珥的形成、相互作用和磁重联的数值模拟。我们的实验考虑了参与日珥之间的手性（相同或相反）和轴向磁场（对齐或相反）的四种可能的基本组合。当由日珥和拱廊组成的全球通量系统的拓扑结构为双极性时，两个结构共用一条极性反转线，那么相同的手性必然意味着轴向场对齐，相反的手性则意味着相反的轴向场。在前一种情况下，外部磁重联形成连接两个日珥的场线；在后一种情况下，这种重新连接是不受欢迎的，并且不会发生连接。这些结果与显著相互作用的经验规则一致。当拓扑结构改为四极时，在日珥之间有一条穿过第一条极性反转线的第二条极性反转线，那么手性和轴向场排列之间的反向关系成立。形成连接场线的外部重联现在发生在手性相反的日珥之间；它们也会发生，但只会导致手性相同的突起之间的脚点交换。这些发现与公认的经验规则相冲突，但可能尚未在迄今为止的观察中得到验证。我们所有的模型日珥，特别是那些经历连接重联的日珥，都包含大量的磁剪切和磁扭曲。然而，没有任何迹象显示不稳定或失去平衡，可能最终爆发。
We report numerical simulations of the formation, interaction, and magnetic reconnection between pairs of solar prominences within the sheared-arcade model. Our experiments consider the four possible basic combinations of chiralities (identical or opposite) and axial magnetic fields (aligned or opposed) between the participating prominences. When the topology of the global flux system comprising the prominences and arcades is bipolar, so that a single polarity inversion line is shared by the two structures, then identical chiralities necessarily imply aligned axial fields, while opposite chiralities imply opposed axial fields. In the former case, external magnetic reconnections forming field lines linking the two prominences occur; in the latter, such reconnections are disfavored, and no linkage takes place. These results concur with empirical rules for prominence interactions. When the topology instead is quadrupolar, so that a second polarity inversion line crossing the first lies between the prominences, then the converse relation holds between chirality and axial-field alignment. External reconnections forming linking field lines now occur between prominences with opposite chiralities; they also occur, but result only in footpoint exchanges, between prominences with identical chiralities. These findings conflict with the accepted empirical rules but may not have been tested in observations to date. All of our model prominences, especially those that undergo linking reconnections, contain substantial magnetic shear and twist. Nevertheless, none exhibits any sign of onset of instability or loss of equilibrium that might culminate in an eruption.