Bombs and Flares at the Surface and Lower Atmosphere of the Sun
Bombs and Flares at the Surface and Lower Atmosphere of the Sun
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DOI：
10.3847/1538-4357/aa6844
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发表时间：
2017-04
期刊：
影响因子：
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通讯作者：
V. Hansteen;V. Archontis;T. Pereira;M. Carlsson;L. R. van der Voort;J. Leenaarts
中科院分区：
文献类型：
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作者：
V. Hansteen;V. Archontis;T. Pereira;M. Carlsson;L. R. van der Voort;J. Leenaarts
太阳活动的一个壮观表现是 Hα 线远翼出现短暂的增亮，称为埃勒曼炸弹 (EB)。界面区域成像摄谱仪最近获得的观测结果揭示了另一种类型的等离子体“炸弹”（紫外线爆发），其高温可能在较低的太阳大气层中高达 8 × 104 K。需要显示此类事件的现实数值模型来解释其性质。在这里，我们报告了太阳大气中磁通量出现的 3D 辐射磁流体动力学模拟。我们发现，新兴双极磁场之间无处不在的重新连接可以触发光球层中的电子束、中/低色球层中的紫外线爆发以及上色球层中的小型（纳米/微米）耀斑（106 K）。这些结果为日冕磁场的出现和建立以及太阳表面和低层大气的动力学和加热提供了新的见解。
A spectacular manifestation of solar activity is the appearance of transient brightenings in the far wings of the Hα line, known as Ellerman bombs (EBs). Recent observations obtained by the Interface Region Imaging Spectrograph have revealed another type of plasma “bombs” (UV bursts) with high temperatures of perhaps up to 8 × 104 K within the cooler lower solar atmosphere. Realistic numerical modeling showing such events is needed to explain their nature. Here, we report on 3D radiative magnetohydrodynamic simulations of magnetic flux emergence in the solar atmosphere. We find that ubiquitous reconnection between emerging bipolar magnetic fields can trigger EBs in the photosphere, UV bursts in the mid/low chromosphere and small (nano-/micro-) flares (106 K) in the upper chromosphere. These results provide new insights into the emergence and build up of the coronal magnetic field and the dynamics and heating of the solar surface and lower atmosphere.