Statistical Analysis of Small Ellerman Bomb Events
Statistical Analysis of Small Ellerman Bomb Events
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DOI：
10.1007/s11207-012-0222-3
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发表时间：
2013-01
期刊：
影响因子：
2.8
通讯作者：
C. Nelson;J. Doyle;R. Erdélyi;Z. Huang;M. Madjarska;M. Mathioudakis;S. Mumford;K. Reardon
中科院分区：
文献类型：
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作者：
C. Nelson;J. Doyle;R. Erdélyi;Z. Huang;M. Madjarska;M. Mathioudakis;S. Mumford;K. Reardon
事实证明，埃勒曼炸弹 (EB) 的特性（Hα 线翼中的小范围增亮）很难确定，因为它们的尺寸甚至接近最先进望远镜的空间分辨率。在这里，我们的目标是使用干涉二维光谱仪（IBIS）和太阳大气快速振荡（ROSA）仪器以及太阳动力学观测站（SDO）上的日震和磁成像仪（HMI）收集的新兴活动区域的高分辨率数据来推断电子束的大小和寿命。我们开发了一种算法来跟踪 EB 的演化过程，发现 EB 通常比之前的估计小得多（约 0.3 英寸）且寿命短（不到一分钟）。还发现了 G 波段磁亮点和 EB 之间的相关性。结合 SDO/HMI 和 G 波段数据可以很好地表示垂直磁场的极性。研究发现，电子束经常发生在相反极性通量和强单极场的区域，这可能暗示磁重联是这些事件的驱动因素。电子束事件的能量学被发现遵循纳耀斑 (1022−25ergs) 范围内的幂律分布。
The properties of Ellerman bombs (EBs), small-scale brightenings in the Hα line wings, have proved difficult to establish because their size is close to the spatial resolution of even the most advanced telescopes. Here, we aim to infer the size and lifetime of EBs using high-resolution data of an emerging active region collected using theInterferometric BIdimensional Spectrometer(IBIS) andRapid Oscillations of the Solar Atmosphere(ROSA) instruments as well as theHelioseismic and Magnetic Imager(HMI) onboard theSolar Dynamics Observatory(SDO). We develop an algorithm to track EBs through their evolution, finding that EBs can often be much smaller (around 0.3″) and shorter-lived (less than one minute) than previous estimates. A correlation between G-band magnetic bright points and EBs is also found. Combining SDO/HMI and G-band data gives a good proxy of the polarity for the vertical magnetic field. It is found that EBs often occur both over regions of opposite polarity flux and strong unipolar fields, possibly hinting at magnetic reconnection as a driver of these events.The energetics of EB events is found to follow a power-law distribution in the range of a nanoflare (1022−25ergs).