Observation of bi-directional jets in a prominence
Observation of bi-directional jets in a prominence
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DOI：
10.1051/0004-6361/201935774
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发表时间：
2021-05
影响因子：
6.5
通讯作者：
A. Hillier;V. Polito
中科院分区：
文献类型：
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作者：
A. Hillier;V. Polito
静止日珥承载着大范围的流动，其中许多是由浮力驱动的，这导致了速度剪切。这些剪切流的存在可以弯曲和拉伸磁场，从而形成电流片，从而导致磁重联。虽然这种现象被假设发生在日珥，一些观察也暗示了这一过程，但缺乏明确的证据。在本文中，我们介绍了2015年6月30日使用界面区域成像光谱仪Si IV和Mg II狭颚成像仪对日珥内部发生的两个双向射流的观测结果。这种喷流与磁重联理论的预测高度一致。利用这一观测结果，我们估计所研究的日珥的环境磁场强度在4.5 - 9.2 G之间，“湍流”磁场强度为1 G。我们的研究结果强调了重力驱动流拉伸和折叠日珥磁场的能力，这意味着在局部，静止的日珥场可能远离静态的、无力的磁场。
Quiescent prominences host a large range of flows, many driven by buoyancy, which lead to velocity shear. The presence of these shear flows could bend and stretch the magnetic field resulting in the formation of current sheets which can lead to magnetic reconnection. Though this has been hypothesised to occur in prominences, with some observations that are suggestive of this process, clear evidence has been lacking. In this paper we present observations performed on June 30, 2015 using the Interface Region Imaging Spectrograph Si IV and Mg II slit-jaw imagers of two bi-directional jets that occur inside the body of the prominence. Such jets are highly consistent with what would be expected from magnetic reconnection theory. Using this observation, we estimate that the prominence under study has an ambient field strength in the range of 4.5−9.2 G with ‘turbulent’ field strengths of 1 G. Our results highlight the ability of gravity-driven flows to stretch and fold the magnetic field of the prominence, implying that locally, the quiescent prominence field can be far from a static, force-free magnetic field.