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arXiv 1802.01798astro-ph.SR
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熔绳断裂与井喷旋转射流的形成

Flux Rope Breaking and Formation of a Rotating Blowout Jet

Navin Chandra Joshi, Naoto Nishizuka, Boris Filippov, Tetsuya Magara, Andrey G. Tlatov

摘要:

我们使用SDO拍摄的多波长观测结果分析了一个小通量绳喷发转换为扇形脊柱配置中的螺旋井喷射流,该事件发生在2016年1月9日的边缘附近。在我们的研究中,首先,我们用位场计算方法估计了扇脊磁位形,发现扇脊磁位形内部有一条左旋的小暗条,暗条随磁绳一起向上喷发,并与周围的扇脊磁位形相互作用,磁绳在中段断裂。我们观察到致密的增亮,耀斑带和耀斑后环下爆发的灯丝。磁绳的北段与周围的正极重新连接,而南段则拉直。接下来,我们观察到南腿的解旋运动,它被转化为旋转的螺旋喷流。微灯丝的螺旋度的符号与旋转喷流的符号相匹配。这与Adams等人(2014)和Sterling等人(2015)提出的射流模型一致。我们专注于旋转喷流的精细螺纹结构,并跟踪了速度为60-120 km/s的三个斑点,而喷流的径向速度约为400 km/s。喷流的解扭运动加速了等离子体沿着准直的外脊场线向上运动,最后在大约9 Rsun的高度演变成一个狭窄的日冕物质抛射。在详细分析的基础上,我们讨论了在扇脊磁位形中磁通绳断裂和螺旋喷流形成的明显证据。

英文摘要:

We analyzed a small flux rope eruption converted into a helical blowout jet in a fan-spine configuration using multi-wavelength observations taken by SDO, which occurred near the limb on 2016 January 9. In our study, first, we estimated the fan-spine magnetic configuration with the potential field calculation and found a sinistral small filament inside it. The filament along with the flux rope erupted upward and interacted with the surrounding fan- spine magnetic configuration, where the flux rope breaks in the middle section. We observed compact brightening, flare ribbons and post-flare loops underneath the erupting filament. The northern section of the flux rope reconnected with the surrounding positive polarity, while the southern section straightened. Next, we observed the untwisting motion of the southern leg, which was transformed into a rotating helical blowout jet. The sign of the helicity of the mini-filament matches the one of the rotating jet. This is consistent with the jet models presented by Adams et al. (2014) and Sterling et al. (2015). We focused on the fine thread structure of the rotating jet and traced three blobs with the speed of 60-120 km/s, while the radial speed of the jet is approx 400 km/s. The untwisting motion of the jet accelerated plasma upward along the collimated outer spine field lines, and it finally evolved into a narrow coronal mass ejection at the height of approx 9 Rsun . On the basis of the detailed analysis, we discussed clear evidence of the scenario of the breaking of the flux rope and the formation of the helical blowout jet in the fan-spine magnetic configuration.

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