爆炸事件-旋转过渡区射流
Explosive events - swirling transition region jets
摘要：
在本文中，我们扩展了我们以前的工作，为另一种情况提供更多的证据来解释所谓的“爆炸性事件”的性质。在过渡区发射光谱中观察到的爆炸事件的双向，快速多普勒运动被经典地解释为一对双向喷流从重联站点向上和向下移动。我们讨论这样一个模型的问题。在我们以前的工作中，我们基本上集中在快速多普勒运动的差异，没有检测到的运动在图像平面。根据我们对某些事件的谱线倾斜和分叉结构的观测，我们提出了另一种爆炸事件的设想。这两个特征都表明狭窄结构中的旋转运动。我们解释了作为旋转的空心圆柱结构的结果的分叉，并表明，这样的鞘模型也可以应用于解释令人费解的“爆炸事件”的性质。我们发现，光谱倾斜，缺乏明显的运动，分叉，以及数量迅速增长的直接观测支持一个替代方案的线性，针状大小的射流具有较强的旋转运动。
英文摘要：
In this paper, we extend our earlier work to provide additional evidence for an alternative scenario to explain the nature of so-called `explosive events'. The bi-directed, fast Doppler motion of explosive events observed spectroscopically in the transition region emission is classically interpreted as a pair of bidirectional jets moving upward and downward from a reconnection site. We discuss the problems of such a model. In our previous work, we focused basically on the discrepancy of fast Doppler motion without detectable motion in the image plane. We now suggest an alternative scenario for the explosive events, based on our observations of spectral line tilts and bifurcated structure in some events. Both features are indicative of rotational motion in narrow structures. We explain the bifurcation as the result of rotation of hollow cylindrical structures and demonstrate that such a sheath model can also be applied to explain the nature of the puzzling `explosive events'. We find that the spectral tilt, the lack of apparent motion, the bifurcation, and a rapidly growing number of direct observations support an alternative scenario of linear, spicular-sized jets with a strong spinning motion.
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