Harsh Mathur, K Nagaraju, Hemanth Pruthvi, K Sagaynathan
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引用次数: 0
Abstract
We present measurements of seeing-induced crosstalk using spectropolarimetric observations of sunspots recorded simultaneously in the Hα and Ca ii 8662 Å lines with the Kodaikanal Tower Tunnel (KTT) telescope. The Kodaikanal Tower Tunnel telescope is integrated and installed with an image stabilization system consisting of a tip-tilt and an autoguider system. Additionally, the spectropolarimeter at KTT is upgraded to allow for the simultaneous recording of spectropolarimetric observations in three spectral lines. The tip-tilt system is shown to have a cutoff frequency of 80 Hz, effectively reducing the seeing induced crosstalk in the measured Stokes parameters by at least a factor of 2.
我们利用 Kodaikanal 塔隧道（KTT）望远镜同时记录的 H α 和 Ca ii 8662 Å 线对太阳黑子进行的分光测地观测，对视诱发的串扰进行了测量。Kodaikanal 塔隧道望远镜集成并安装了一个图像稳定系统，该系统由一个尖端倾斜装置和一个自动导向器系统组成。此外，KTT 的分光测偏仪也进行了升级，可同时记录三条光谱线的分光测偏观测数据。事实证明，尖端倾斜系统的截止频率为 80 赫兹，可有效减少测量斯托克斯参数中由视线引起的串扰，减少幅度至少为 2 倍。
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