【摘要】：平場改正可以扣除日冕儀成像過程中的不均勻性,是其數(shù)據(jù)定標(biāo)的必要步驟。提出一套基于乳白玻璃測量日冕儀平場的裝置和方法,并開展了相關(guān)模擬和實地測量以驗證該方法的可行性。首先,模擬了太陽經(jīng)乳白玻璃后在日冕儀觀測視場內(nèi)擴(kuò)散光源的均勻性,模擬結(jié)果表明其均勻度為99.98%,十分接近理想的均勻面光源。其次,測量了12cm地基日冕儀的平場,測量結(jié)果顯示該方法可以測量出日冕儀成像的不均勻性,如探測器的條紋。平場改正后的結(jié)果符合日冕和天空背景亮度的徑向分布。最后,為評價利用乳白玻璃測量平場的有效性,將其和天空平場進(jìn)行了對比,二者相關(guān)系數(shù)為99.94%,線性擬合斜率為1,具有極強(qiáng)的相關(guān)性。
[Abstract]:The correction of flat field can deduct the inhomogeneity in the imaging process of coronal instrument and is the necessary step to calibrate its data. This paper presents a set of apparatus and method for measuring coronal flattening field based on milk white glass, and carries out related simulation and field measurements to verify the feasibility of the method. First, the uniformity of the diffusive light source in the field of view observed by the sun through the milky glass is simulated. The simulation results show that the uniformity is 99.98, which is very close to the ideal uniform surface light source. Secondly, the flat field of the coronal instrument based on 12cm is measured. The results show that the method can measure the inhomogeneity of the coronal imaging, such as the fringes of the detector. The corrected results of the flat field accord with the radial distribution of the brightness of the coronal and sky background. Finally, in order to evaluate the effectiveness of using glass to measure the flat field, the correlation coefficient is 99.94 and the slope of linear fitting is 1, which has a strong correlation with the sky flat field.
【作者單位】： 中國科學(xué)院太陽活動重點(diǎn)實驗室;中國科學(xué)院國家天文臺;中國科學(xué)院國家空間科學(xué)中心;中國科學(xué)院云南天文臺;
【基金】：國家自然科學(xué)基金(11427901,11503063,11427803,11273034,11373040,11573012) 中國科學(xué)院先導(dǎo)B項目(XDB09040200);中國科學(xué)院太陽活動重點(diǎn)實驗室開放課題(KLSA201514,KLSA201515,KLSA201616)
【分類號】：TH753.12

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