爆炸事件螺旋度的光谱证据
Spectroscopic evidence for helicity in explosive events
摘要：
我们报告的光谱观测支持一个新的观点过渡区爆炸事件，观察提供经验证据表明，至少在某些情况下，爆炸事件可能只是旋转狭窄的针状结构。我们的光谱教科书爆炸事件的同时多普勒流的红色和蓝色的组件是极端的情况下，高光谱速度，缺乏明显的运动，预计如果解释为一对准直，线性移动的射流。意识到这一矛盾，我们对红移和蓝移的另一种解释是小等离子体体积的旋转运动。与双向喷流的情况相反，少量的旋转等离子体将与没有可检测的明显运动的流动的观察完全兼容。我们怀疑这些小体积可能是针状结构，并试图找到证据。我们观察到的螺旋运动macrosicules和认为，这些功能-如果按比例缩小到一个半径相当于一个光谱仪的狭缝大小-应该有一个光谱签名类似于爆炸事件中观察到的，而不容易检测到的成像仪。尽管有这个困难，在骨针螺旋的证据已在文献中报道。这启发了我们的新见解，即相同的狭窄旋转结构可能是这两种情况下的驱动因素，成像仪观察到的结构是针状物，而光谱仪则穿过狭缝并被视为爆炸事件。我们到达一个概念，支持的想法，爆炸事件和针状体是不同的表现形式相同的螺旋驱动的情况。因此，在这种情况下，必须假设光球或亚光球触发。
英文摘要：
We report spectroscopic observations in support of a novel view of transition region explosive events, observations that lend empirical evidence that at least in some cases explosive events may be nothing else than spinning narrow spicule-like structures. Our spectra of textbook explosive events with simultaneous Doppler flow of a red and of a blue component are extreme cases of high spectro-scopic velocities that lack apparent motion, to be expected if interpreted as a pair of collimated, linearly moving jets. The awareness of this conflict led us to the alternate interpretation of redshift and blueshift as spinning motion of a small plasma volume. In contrast to the bidirectional jet scenario, a small volume of spinning plasma would be fully compatible with the observation of flows without detectable apparent motion. We suspect that these small volumes could be spicule-like structures and try to find evidence. We show observations of helical motion in macrospicules and argue that these features - if scaled down to a radius comparable to the slit size of a spectrometer - should have a spectroscopic signature similar to that observed in explosive events, while not easily detectable by imagers. Despite of this difficulty, evidence of helicity in spicules has been reported in the literature. This inspired us to the new insight that the same narrow spinning structures may be the drivers in both cases, structures that imagers observe as spicules and that in spectrometers cross the slit and are seen as explosive events. We arrive at a concept that supports the idea that explosive events and spicules are different manifestations of the same helicity driven scenario. Consequently, in such a case, a photospheric or subphotosperic trigger has to be assumed.
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