本文研究了太阳光球层中Fe I 630.2nm谱线的Stokes V型异常轮廓的形成。数值2-D MHD模拟的太阳磁粒化的结果用于此。在它们的性质上,具有极不对称性的合成异常轮廓与在网络和网络间区域中以优于1 "的空间分辨率观察到的异常轮廓相似。根据我们的研究结果,在弱混合极性磁场区,异常剖面多沿极性反转线成簇出现。通常,它们位于颗粒和泳道的边缘,有时它们会在具有高速度和磁场强度梯度的强磁场集中附近相遇。结果发现,它们在大颗粒分解和新的磁通量管开始形成的区域中以簇的形式出现。不寻常的$V$轮廓可能有一至六个叶。单瓣和多瓣轮廓具有相同的起源。导致极不对称的轮廓的处理的特征在于沿视线的一个或多个极性反转以及复杂的速度和场强梯度。轮廓波瓣的数量越大,场梯度符号改变的概率越大。因此,在极不对称的$V$分布的形成区域中,磁场应该非常复杂。MHD颗粒模拟的直接结果证实了这一点,该结果表明,在下吃水边缘的速度剪切形成了涡流和湍流。这些过程通过混合场极性,特别是在颗粒的边缘,增加了磁场结构的复杂性。
英文摘要:
The formation of unusually shaped Stokes V profiles of the Fe I 630.2 nm line in the solar photosphere are investigated. The results of numerical 2-D MHD simulation of solar magnetogranulation are used for this. In their properties, the synthetic unusual profiles with extremely asymmetry are similar to the unusual profiles observed with a spatial resolution better than 1" in the network and internetwork regions. According to our results the unusual profiles mostly appear in clusters along the polarity inversion lines in the regions of weak magnetic fields with mixed polarity. As a rule, they are located at the edges of granules and lanes, and sometimes they are met close to strong magnetic field concentrations with high velocity and magnetic field strength gradients. They turned out to appear as clusters in the regions where large granules disintegrate and new magnetic flux tubes begin to form. The unusual $V$ profiles may have from one to six lobes. The one-lobe and multilobe profiles are of the same origin. The processing causing the extreme asymmetry of the profiles are characterized by one or several polarity reversal along the line of sight as well as by complicated velocity and field strength gradients. The greater the number of profile lobes, the greater is the probability of the field gradient sign change. Hence it follows that the magnetic field should be very complicated in the regions of formation of extremely asymmetric $V$ profiles. This is confirmed by immediate results of MHD granulation simulations, which demonstrate the formation of vortices and turbulence by the velocity shear at down draft edges. These processes add complexity to the magnetic field structure by mixing field polarities, particularly at the edges of granules.
Recent Advances in the Exploration of the Small-Scale Structure of the Quiet Solar Atmosphere: Vortex Flows, the Horizontal Magnetic Field, and the Stokes-V Line-Ratio Method
我们回顾了(i)太阳大气中涡旋流的观测和数值模拟以及(ii)平静太阳区域水平磁场的测量。首先,我们讨论了各种表现形式的旋涡流,并强调调解漩涡运动的磁场的太阳表面附近的光球层和色球层的高层的作用。我们重新审视现有的太阳表面磁对流的模拟运行方面的旋涡流,并比较以前获得的结果。其次,我们回顾了与测量太阳宁静区磁场角分布相关的矛盾结果和问题。此外,我们回顾了斯托克斯-V-振幅比方法的线Fe I 630.15和630.25 nm。我们得出的结论是,最近发现的两个不同的人口在散点图中的这个比例不能被解释为“未塌陷”和“塌陷”的领域,但它们源于弱颗粒磁场和弱冠层场位于颗粒之间的边界和粒间空间。基于新的模拟运行,我们重申了先前的研究结果的水平场分量的优势超过垂直的,特别是在上层光球和色球层的底部。
A Hot Downflowing Model Atmosphere For Umbral Flashes And The Physical Properties Of Their Dark Fibrils
我们执行NLTE反演在一个大的本影闪光,包括黑暗的纤维可见,在他们,并在静止的本影通过使用反演代码NICOLE上的一组全斯托克斯高分辨率的Ca II 8542 A观测的太阳黑子在磁盘中心。我们发现,暗结构的斯托克斯配置文件是不同的静态和闪光区。它们最好由在速度方面更类似于闪光大气的大气再现,即使振幅减小。我们还发现了两套解决方案,精细地适合闪光的配置文件:一组是向上流动,具有过渡区,这是更深的比在静止的情况下,并在温度略有下降之前,和第二个解决方案,在色球层中的一个较热的气氛,但具有接近声速在这样的高度下降流。这种下降流可能与日冕环的存在有关,甚至取决于日冕环的存在,日冕环植根于太阳黑子的本影,就像在分析的区域中的情况一样。类似的环最近被观察到在过渡区有超音速的下降流,这与早期的“太阳黑子羽流”一致,后者总是被发现在太阳黑子中显示出强烈的下降流。最后,我们发现,平均而言,磁场减少的闪光区,这表明冲击压力是移动的磁力线在上层。
Diagnosing the solar atmosphere through the Mg I b$_2$ 5173 Å line. II. Morphological classification of the intensity and circular polarization profiles
该研究基于瑞典1米太阳望远镜高分辨率观测,用欧氏距离分类 Mg I b$_2$ 的 Stokes I/V 轮廓,并结合 Fe I 双线全 Stokes NLTE/LTE 反演揭示温度极小区物理环境。
ELemental abundances of Planets and brown dwarfs Imaged around Stars (ELPIS): II. The Jupiter-like Inhomogeneous Atmosphere of the First Directly Imaged Planetary-Mass Companion 2MASS 1207 b