钾原子滤光器在太阳高分辨率观测中的应用

太阳高分辨率速度场观测系统可用于探测日震的活动信息，对太阳内部结构的研究具有重要意义。探讨了双峰钾原子滤光器在太阳光球层速度场观测中的应用方法，即利用法拉第反常色散原子滤光器(FADOF)的高光谱分辨率和光谱稳定性等优点，采用双峰钾原子滤光器分辨来自太阳光球层钾线(769.898 nm)光谱的多普勒频移，并提出用F-P标准具对透过原子滤光器的双峰信号进行光学选支，从而获得太阳光球层多普勒速度场图像。研制出双透射峰钾原子滤光器原理样机，经测试其谱型与理论谱型符合良好，满足太阳速度场高分辨率观测的需要。将此技术方案扩展到太阳的其他谱线，可实现对太阳大气多层次速度场的同时观测。

Abstract

The observation system of solar velocity field can be used to detect the activities of helioseismology, which is important for the study of the solar internal structure. The method of using K-FADOF to observe the velocity field of photosphere is studied, which takes advantage of the Faraday anomalous dispersion optical filter (FADOF), such as high spectral resolution and spectral stability. This method utilizes K-FADOF to distinguish the Doppler shift of potassium line (769.898 nm) which comes from the Sun′s Photosphere, uses the F-P etalon to select the single-peak signal transmitted through the K-FADOF, and receives photosphere′s Dopplergram. The prototype of K-FADOF is developed and tested. The experiments show that its experimental transmission spectrum pattern almost coincides with its theoretical pattern. It indicates that the K-FADOF meets the requirements of observing the solar velocity field of high spectral resolution. Further, it can achieve to observe simultaneously multi-layer velocity field of the solar atmosphere with this technology extended to the solar other lines.

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张俊, 杨勇, 程学武, 杨尚斌, 龚威. 钾原子滤光器在太阳高分辨率观测中的应用[J]. 中国激光, 2012, 39(8): 0808003. Zhang Jun, Yang Yong, Cheng Xuewu, Yang Shangbin, Gong Wei. Application of K-FADOF in Solar High-Resolution Observation[J]. Chinese Journal of Lasers, 2012, 39(8): 0808003.

钾原子滤光器在太阳高分辨率观测中的应用

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