动态Ly α射流
Dynamic Ly alpha jets
摘要：
太阳色球层和过渡区是高度结构化和复杂的区域。最近的一个突破已被识别的动态纤维观察到的H α所造成的磁场对齐磁声冲击。我们试图找到这样的动态原纤维是否也观察到赖氨酸α。我们使用了一个简短的序列的四个高分辨率的Ly阿尔法图像的太阳边缘所采取的非常高的角分辨率紫外线望远镜（VALESS），它显示了许多延伸和收缩的Ly阿尔法喷流。我们测量了它们的顶部轨迹，并将抛物线拟合到30个定义最好的轨迹上。大多数喷气式飞机都以超音速飞行。其中一半减速，有时是超弹道，另一半加速。这种分歧可能是由于对经常性喷流的不完全采样造成的。动态Ly α射流和H α纤维之间的相似性表明，磁声冲击引起动态H α纤维也影响动态Ly α射流。
英文摘要：
The solar chromosphere and transition region are highly structured and complex regimes. A recent breakthrough has been the identification of dynamic fibrils observed in H alpha as caused by field-aligned magnetoacoustic shocks. We seek to find whether such dynamic fibrils are also observed in Ly alpha. We used a brief sequence of four high-resolution Ly alpha images of the solar limb taken by the Very high Angular resolution ULtraviolet Telescope (VAULT), which displays many extending and retracting Ly alpha jets. We measured their top trajectories and fitted parabolas to the 30 best-defined ones. Most jet tops move supersonically. Half of them decelerate, sometimes superballistically, the others accelerate. This bifurcation may arise from incomplete sampling of recurrent jets. The similarities between dynamic Ly alpha jets and H alpha fibrils suggest that the magnetoacoustic shocks causing dynamic H alpha fibrils also affect dynamic Ly alpha jets.
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