基于太阳辐照校准地基日冕仪光度的方法研究及初步测试  

Study on the method of the photometry calibration of ground-based coronagraph according to solar irradiance and preliminary test

作　　者：唐宁[1] 于晓雨 刘大洋 王翔宇[1] 韩建平 孙明哲[1] 刘维新[1] 夏利东[1] TANG Ning;YU XiaoYu;LIU DaYang;WANG XiangYu;HAN JianPing;SUN MingZhe;LIU WeiXin;XIA LiDong(Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment,Institute of Space Science,Shandong University,Weihai Shandong 264209,China)

机构地区：[1]山东大学空间科学研究院山东省光学天文与日地空间环境重点实验室,山东威海264209

出　　处：《地球物理学报》2023年第3期881-890,共10页Chinese Journal of Geophysics

基　　金：国家自然科学基金(U1931122,41904168);国家重大科技-空间环境地基综合监测网项目(子午工程二期);山东大学实验室建设与管理研究项目(sy20202502,sy20203502)资助。

摘　　要：利用地基日冕仪对更靠近太阳临边的日冕进行成像观测,对于深入研究日冕结构的产生及演化等非常重要.为得到准确的观测数据,本论文提出了地基日冕仪光度校准和补偿方法.针对观测谱线为530.3 nm的地基日冕仪原理样机,我们搭建了实验室测试系统校准日冕仪.同时,为对大气传输路径上的光损失进行补偿,我们研制了太阳辐照计,用于同步记录太阳光球辐照度作为参考基准.在威海进行了实地观测,实验表明:采用不同光电探测器的两套辐照计地面测试结果的相对偏差不超过0.5%,由此估计地基日冕仪光度校准总的相对不确定度约为0.54%,验证了该方法是精确和可行的.据此确立的数据处理流程将用于子午工程二期建设设备中光谱成像日冕仪的科学数据产出,并可为空间日冕仪光度校准提供可能的解决方案.The ground-based coronagraph can acquire image data of the corona very close to the sun edge, which is very important to study the formation and evolution of the coronal structure. In order to make the observation data more accurate, this paper proposed a photometric calibration and compensation method for the ground-based coronagraph. Targeting at the principle prototype of the ground-based coronagraph with the observation spectral line of 530.3nm, we have built a testing and calibration system in laboratory. Meanwhile, in order to compensate the light loss along the atmospheric transmission path, we have developed a solar irradiatometer to synchronously record the photosphere irradiance as a reference. The joint observation of coronagraph and the solar irradiatometer shows that the relative deviation of the two sets of irradiatometers with different photodetectors is less than 0.5%. And the total relative uncertainty of photometric calibration of ground-based coronagraph is estimated to be about 0.54%, which verifies that the calibration and compensation method is feasible and accurate. This established data processing flow thus could be used for the scientific data acquisition of Spectral Imaging Coronagraph in the second phase of the Meridian Project, and could also provide a possible solution for photometric calibration of space-based coronagraph.

关 键 词：日冕 光度 日冕仪 太阳辐照 

分 类 号：P353[天文地球—空间物理学]