论文标题
半诊断的半光谱分析
A multi-diagnostic spectral analysis of penumbral microjets
论文作者
论文摘要
半月是短暂的，类似喷气的物体，在黑子的半子中发现。它们最初是在色层线中发现的，后来还显示出在过渡区域（TR）线中显示信号。他们的进化起源和方式尚未解决。我们通过使用从光电到TR温度的光谱诊断来对PMJ进行全面分析以限制PMJ属性。 We employed high-spatial-resolution Swedish 1-m Solar Telescope observations in the Ca II 8542 Angstrom and H-alpha lines, IRIS slit-jaw images, and IRIS spectral observations in the Mg II h & k lines, the Mg II 2798.75 Angstrom & 2798.82 Angstrom triplet blend, the C II 1334 Angstrom & 1335 Angstrom lines, and the SI IV 1394 Angstrom＆1403 Angstrom线。我们从这些诊断中得出了广泛的光谱诊断，并研究了与PMJ相关的其他次要现象。我们发现，PMJ在我们所有研究的光谱线中表现出不同程度的信号。我们发现在我们的诊断过程中以及与之相关的太阳大气层的所有层次中，多普勒速度和速度梯度低或微不足道。 H-Alpha和Ca II 8542埃氏内部翅膀中的深色特征暗示PMJ沿先前存在的原纤维结构形成。我们发现，通过Mg II三胞胎线的翅膀发射，在PMJ的一部分中进行上光球加热的证据。 PMJ中无处不在的扭曲运动的证据很少。在不同光谱线上PMJ亮度的发病时间没有明显的差异。与早期建议相反，PMJ很可能仅表现出非常适中的质量运动。我们认为，PMJS在刚刚存在的原纤维结构处的上光晶或色球层高度形成。
Penumbral microjets (PMJs) are short-lived, jet-like objects found in the penumbra of sunspots. They were first discovered in chromospheric lines and have later also been shown to exhibit signals in transition region (TR) lines. Their origin and manner of evolution is not yet settled. We perform a comprehensive analysis of PMJs through the use of spectral diagnostics that span from photospheric to TR temperatures to constrain PMJ properties. We employed high-spatial-resolution Swedish 1-m Solar Telescope observations in the Ca II 8542 Angstrom and H-alpha lines, IRIS slit-jaw images, and IRIS spectral observations in the Mg II h & k lines, the Mg II 2798.75 Angstrom & 2798.82 Angstrom triplet blend, the C II 1334 Angstrom & 1335 Angstrom lines, and the Si IV 1394 Angstrom & 1403 Angstrom lines. We derived a wide range of spectral diagnostics from these and investigated other secondary phenomena associated with PMJs. We find that PMJs exhibit varying degrees of signal in all of our studied spectral lines. We find low or negligible Doppler velocities and velocity gradients throughout our diagnostics and all layers of the solar atmosphere associated with these. Dark features in the inner wings of H-alpha and Ca II 8542 Angstrom imply that PMJs form along pre-existing fibril structures. We find evidence for upper photospheric heating in a subset of PMJs through emission in the wings of the Mg II triplet lines. There is little evidence for ubiquitous twisting motion in PMJs. There is no marked difference in onset-times for PMJ brightenings in different spectral lines. PMJs most likely exhibit only very modest mass-motions, contrary to earlier suggestions. We posit that PMJs form at upper photospheric or chromospheric heights at pre-existing fibril structures.
