AI 中文总结
本研究利用DKIST/ViSP光谱偏振观测，分析谱斑中Na I和Ca II谱线的低色球层波，发现慢磁声波向上传播且相位关系呈香肠状，但波通量不足以加热活动区谱斑。
AI 中文摘要
我们分析了由丹尼尔·井上太阳望远镜（DKIST）上的可见光光谱偏振仪（ViSP）获得的太阳谱斑的高时间分辨率光谱偏振观测，以研究由Na I D1 5896埃和Ca II 8542埃谱线采样的低色球层波。观测以倾斜视角进行，从而对横向运动具有敏感性。谱斑元素内的磁振荡在Na I D1谱线中表现出显著的视线方向（LOS）均方根振幅，平均约为9高斯，而相应的Ca II振荡仅略高于噪声水平。自适应轮廓跟踪提供了谱线核心强度和多普勒速度，弱场近似提供了视线方向磁场，非局部热力学平衡（non-LTE）反演提供了质量密度和形成高度。交叉谱分析显示速度-强度相位分布耦合在-90度，与压缩振荡一致。Na I-Ca II中的速度相位表明向上传播，且相速度主要低于阿尔芬速度，与慢磁声波一致。尽管狭缝几何结构阻止了对管本征模式的明确识别，但不同的磁相位关系表明在磁扰动与压缩扰动耦合中存在随高度变化的香肠状行为。此外，我们推断的波通量不足以加热活动区谱斑。
英文摘要
We analyze high-cadence spectropolarimetric observations of solar plage obtained with the Visible Spectro-Polarimeter (ViSP) on the Daniel K. Inouye Solar Telescope (DKIST) to investigate low-chromospheric waves sampled by the Na I D1 5896 Angstrom and Ca II 8542 Angstrom lines. Observations were taken at an oblique viewing angle, providing sensitivity to transverse motions. Magnetic oscillations within plage elements exhibit significant line-of-sight (LOS) RMS amplitudes of approximately 9 G on average in the Na I D1 line, whereas the corresponding Ca II oscillations are only marginally above the noise level. Adaptive profile tracking provided line-core intensities and Doppler velocities, the weak-field approximation provided LOS magnetic fields, and non-LTE inversions provided mass densities and formation heights. Cross-spectral analysis shows velocity-intensity phase distributions coupled at -90 degrees, consistent with compressive oscillations. The velocity phases in Na I-Ca II indicate upward propagation and the phase speeds are predominantly sub-Alfvenic, consistent with slow magnetoacoustic waves. Although the slit geometry prevents a definitive identification of the tube eigenmode, the differing magnetic phase relationships suggest a height-dependent sausage-like behavior in the coupling between the magnetic and compressive perturbations. Additionally, our inferred wave fluxes are insufficient to heat active-region plage.
CommentsAccepted for publication in Frontiers in Astronomy and Space Sciences
