基于恒星辐射稳定性的全天空极光成像仪辐射定标方法  

Radiation Calibration of All-Sky Auroral Imager Based on Stellar Radiation Stability

作　　者：韩冰[1] 李国君 胡泽骏[2] 张义生 Han Bing;Li Guojun;Hu Zejun;Zhang Yisheng(School of Electronic Engineering,Xidian University,Xi'an,Shaanxi 710071,China;MNR Key Laboratory of Polar Science,Polar Research Institute of China,Shanghai 200136,China;Institute of Applied Meteorology,Beijing 100029,China)

机构地区：[1]西安电子科技大学电子工程学院,陕西西安710071 [2]中国极地研究中心,自然资源部极地科学重点实验室,上海200136 [3]北京应用气象研究所,北京100029

出　　处：《光学学报》2021年第5期55-65,共11页Acta Optica Sinica

基　　金：国家重点研发计划(2018YFC1407303,2016YFC1400300);国家自然科学基金(41874195,41831072,61572384,61432014);中国科学院空间科学先导专项(XDA15350202,XDA15052400);“国际子午圈关键科学问题国际合作预先研究”(A131901W14)。

摘　　要：全天空极光成像仪是一种重要的地基极光观测设备,对全天空成像仪进行辐射参数定标能够获得全天空图像中极光结构在不同观测谱线上的真实激发强度,这对于空间物理过程的定量研究有着重要的意义。受到极区观测台站的条件限制,许多全天空极光成像仪无法在观测现场进行辐射参数定标。为此,提出一种基于恒星辐射稳定性对全天空成像仪进行辐射参数定标的方法,把恒星作为"虚拟标准光源",利用全天空成像仪获取的星空图进行辐射定标,最终确定辐射强度-图像数值之间的辐射参数。利用更多的恒星亮度作为参考标准,以及电离层卫星探测到的极光沉降电子数据,结合GLOW模型计算的极光激发强度作为参考标准,对定标结果进行了两种不同方法的验证。结果显示,在恒星亮度验证中,恒星亮度偏差最大值为12.22%,平均偏差为4.624%;在卫星沉降粒子验证中,利用模型计算出的极光弧峰值强度与全天空观测获得极光弧峰值强度偏差最大值为11.30%,平均偏差为5.603%。两种验证结果相近,这表明本文所提定标方法是有效和可信的。The all-sky auroral imager is an important ground-based instrument for auroral observation and research.The real excitation intensity of auroras on different wavelengths can be obtained by calibrating the radiation parameter of all-sky imager,which is of great significance for quantitative study of space physics.Due to the conditions of polar observation stations,many all-sky auroral imagers cannot calibrate radiation parameters on the observation site.In this paper,a method to calibrate the radiation parameter of all-sky imager is presented which is based on stellar radiation stability.The stellar is regarded as the virtual standard light source,and the radiation parameter between radiation intensity and image value are finally determined by using the sky map obtained by the all-sky imager.Using more stellar brightness and the precipitating electrons data of aurora detected by ionospheric satellite and the auroral excitation intensity calculated by GLOW model,the radiation parameter of all-sky auroral imager is verified by two different methods.The results show that in the verification of stellar brightness,the maximum deviation is 12.22%,and the average deviation is 4.624%;in the satellite precipitating particle verification,the maximum deviation of the auroral arc peak intensity calculated by the model and all-sky imager is 11.30%,and the average deviation is 5.603%.The two verification results are similar,which shows that the proposed method is effective and credible.

关 键 词：测量 辐射定标 全天空成像仪 恒星辐射 GLOW模型 

分 类 号：P352.7[天文地球—空间物理学]