非等晕效应对NVST高分辨重建结果的影响  

The Analysis of Anisoplanatism's Influence in Different Reconstruction Sub-block Size of NVST

作　　者：李茂林 向永源[1] 金振宇[1] 刘忠[1] 

机构地区：[1]中国科学院云南天文台,云南昆明650011 [2]中国科学院大学,北京100049

出　　处：《天文研究与技术》2018年第1期87-94,共8页Astronomical Research & Technology

基　　金：国家自然科学基金(11573068)资助

摘　　要：根据抚仙湖1 m新真空太阳望远镜高分辨率重建算法,从理论上分析了非等晕效应对斑点干涉术和斑点掩模法的影响。使用实测光球数据以不同子块大小分别进行高分辨数据重建,通过对不同子块大小情况下重建图像的功率谱、相位的比较,对非等晕效应的影响进行分析。结果表明,当重建区域大小超过等晕区时,非等晕效应会限制斑点干涉术和斑点掩模法的有效性,由于算法失效会导致模和相位重建的准确度降低。最后结合图像处理程序的具体情况,对算法的进一步优化提供了建议。According to the high spatial resolution reconstruction algorithm of the lm New Vacuum Solar Telescope （NVST） of the Fuxian-Lake Solar Observation Station, the effects of anisoplanatism on speckle interferometry and speckle masking are analyzed theoretically. The observed photosphere data is processed in different sub-sizes and different images are acquired. By comparing power spectrum of the reconstruction images and the reconstruction phase, the impact of the anisoplanatism on the reconstructed results is analyzed. The anisoplanatism limits the effectiveness of speckle interferometry and speckle masking. When the size of the reconstructed area exceeds the size of the isoplanatic region, the accuracy of the amplitude and phase reconstruction is reduced due to the failure of the algorithm. Finally, combined with the specific circumstances of the image processing program, the suggestion of further optimization of the algorithm is provided.

关 键 词：非等晕效应 1m新真空太阳望远镜 高分辨率重建 

分 类 号：P182.2[天文地球—天文学]