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Calibration of SOT Dopplergrams

机译:SOT多普列卡镜的校准

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Narrow-band Filter Imager on SOT provides Dopplergrams (DGs) which are images of Doppler (line- of-sight) velocities. Observations with DGs are critically important in studies of photospheric dynamics and helioseismology. The primary photospheric line used for DGs is Fe I 5576 A which is a line insensitive to Zeeman effect. We made a calibration function for the 5576 A DGs to get actual Doppler velocities from velocity indexes using an atlas spectrum and simulated transmission profiles for the tunable filter (TF) on SOT. Using data sets taken in the natural sun-light test, we quantitatively evaluated accuracy of the DGs by comparing the rotational speed of the Sun measured with DGs with the expected one. There was a little systematic error in the velocity obtained by SOT, but the error was less than 20 % of the predicted velocities.
机译:SOT上的窄带滤波器成像器提供了多普列法图(DGS),其是多普勒(视图线)速度的图像。在拍摄性动力学和HelioSeismology的研究中,DGS的观测批判性重要。用于DGS的初级拍摄线是FE 5576 A,这是对塞曼效应不敏感的线。我们对5576个DG进行了校准功能,以使用用于在SOT上的可调滤波器(TF)的速率指数从速度索引获取实际多普勒速度。使用在天然防晒测试中采取的数据集,我们通过比较与预期的DG的阳光的旋转速度进行比较来定量评估DGS的准确性。在SOT获得的速度下有一点系统误差,但误差小于预测速度的20%。

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