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arXiv 1709.05066astro-ph.SR
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I.三维磁重联中喷流的形成与演化

I. Jet Formation and Evolution due to 3D Magnetic Reconnection

J. J. González-Avilés, F. S. Guzmán, V. Fedun, G. Verth, S. Shelyag, S. Regnier

摘要:

利用模拟数据驱动的太阳大气三维电阻MHD模拟,我们表明,磁重联可以负责形成的射流与特征的II型针状体。为此,我们使用C7平衡大气模型对光球-日冕区域进行了数值模拟。初始磁位形是一个三维位磁场,从模拟太阳静止时的光球磁对流模型的动态模拟中外推到日冕区。在这种情况下,我们考虑$12.56 ~Ω~{\rm m}$的磁电阻率的均匀和恒定值。我们发现喷流的形成依赖于洛伦兹力,它有助于加速等离子体向上。通过分析急流动力学的各种性质,发现急流结构在高涡度区附近存在多普勒频移。形态、向上速度(覆盖范围高达100 $\rm km$ $\rm s^{-1}$)和结构寿命(大于100 ${\rm s}$)与II型骨针的预期相似。

英文摘要:

Using simulated data-driven three-dimensional resistive MHD simulations of the solar atmosphere, we show that magnetic reconnection can be responsible of the formation of jets with characteristic of Type II spicules. For this, we numerically model the photosphere-corona region using the C7 equilibrium atmosphere model. The initial magnetic configuration is a 3D potential magnetic field, extrapolated up to the solar corona region from a dynamic realistic simulation of solar photospheric magnetoconvection model which is mimicking quiet-Sun. In this case we consider a uniform and constant value of the magnetic resistivity of $12.56 ~Ω~{\rm m}$. We have found that formation of the jets depends on the Lorentz force, which helps to accelerate the plasma upwards. Analyzing various properties of the jet dynamics, we found that the jet structure shows Doppler shift near to regions with high vorticity. The morphology, upward velocity, covering a range up to 100 $\rm km$ $\rm s^{-1}$, and life-time of the estructure, bigger than 100 ${\rm s}$, are similar to those expected for Type II spicules.

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