基于星点的全天空极光图像参数标定及其验证  

Calibration and verification of all-sky auroral image parameters by star maps

作　　者：张会朋 胡泽骏[2] 胡耀垓[1] 周晨[1] ZHANG HuiPeng;HU ZeJun;HU YaoGai;ZHOU Chen(Electronic Information School,Wuhan University,Wuhan 430072,China;Polar Atmospheric and Space Physics Laboratory,Polar Research Institute of China,Shanghai 200136,China)

机构地区：[1]武汉大学电子信息学院,武汉430072 [2]中国极地研究中心,极地大气和空间物理学研究室,上海200136

出　　处：《地球物理学报》2020年第2期401-411,共11页Chinese Journal of Geophysics

基　　金：国家自然科学基金(41874195,41831072,41474146,41431072,41574146,41774162);中组部“国家高层次人才特殊支持计划青年拔尖人才”(W02070249);国家重点研发计划(2018YFC1407303,2016YFC1400301);中国科学院空间科学先导专项(XDA15350202)联合资助

摘　　要：全天空极光成像仪是地基极光观测研究的重要仪器设备,从其拍摄的全天空图像数据中能获得极光形态、尺度、激发强度等重要物理参数,因而精确标定全天空图像,对准确获取极光相关物理参数极为重要.本文提出了一种基于星点位置信息对全天空图像进行标定的方法,通过该方法可以确定全天空图像参数(天顶在全天空图像中的像素点位置,地理方位以及视野范围内成像半径与天顶角的关系).利用电离层卫星探测到的极光沉降电子能谱中的"倒V"结构与极光弧之间的对应关系,对星点标定方法获取的全天空图像参数进行了验证.结果显示卫星穿越的"倒V"结构宽度(60±6km、102±6km)与同时全天空极光成像仪观测到的卫星穿越的极光弧宽度(64.7±7km、111.6±7km)几乎一致,这表明本文提出的全天空极光图像参数的星点标定方法是有效和准确的.The all-sky auroral imager is an important instrument for ground-based auroral observation and research.Man can obtain significant physical parameters such as auroral shape,scale and excitation intensity from such images.Therefore,accurate calibration of the all-sky image is extremely important for acquisition of auroral-related physical parameters.In this paper,a method to calibrate all-sky images is presented which is based on the information of sky maps.This method can be used to determine the all-sky image parameters(e.g.,position of the zenith in the all-sky image,geographic orientation,and the relationship between the imaging radius and the zenith angle).These all-sky image parameters are verified by the correspondence between the auroral arc and the"inverted V"structure in the auroral electron energy spectrum detected by the ionospheric satellite.The verification results show that the width of the"inverted V"structure of the satellite crossing(60±6 km,102±6 km)is almost consistent with the satellite-crossing auroral arc width(64.7±7 km,111.6±7 km)observed by the all-sky aurora imager.It indicates that the sky-map calibration method of all-sky auroral image parameters proposed in this paper is effective and accurate.

关 键 词：星点 全天空图像 图像标定 极光弧 倒V结构 

分 类 号：P351[天文地球—空间物理学]