夜间135.6 nm气辉反演的电离层f_(0)F_(2)与测高仪观测比较研究  

A Comparative Study between the Ionospheric f_(0)F_(2) from Nighttime OI 135.6 nm Emission and Ionosonde Observations

作　　者：薛仕翔 姜春华[1] 马征征[2] 徐彬[2] 丁广兴 杨国斌[1] 张援农[1] 赵正予[1,4] XUE Shixiang;JIANG Chunhua;MA Zhengzheng;XU Bin;DING Guangxing;YANG Guobin;ZHANG Yuannong;ZHAO Zhengyu(School of Electronic Information,Wuhan University,Wuhan 430072;National Key Laboratory of Electromagnetic Environment,China Research Institute of Radiowave Propagation,Qingdao 266107;Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033;Harbin Institute of Technology(Shenzhen),Shenzhen 518055)

机构地区：[1]武汉大学电子信息学院,武汉430072 [2]中国电波传播研究所电波环境特性及模化技术重点实验室,青岛266107 [3]中国科学院长春光学精密机械与物理研究所,长春130033 [4]哈尔滨工业大学(深圳),深圳518055

出　　处：《空间科学学报》2023年第3期456-465,共10页Chinese Journal of Space Science

基　　金：中国电波传播研究所稳定支持科研经费项目(A132001W03);国家自然科学基金项目(42104166)共同资助。

摘　　要：在夜间电离层,气辉135.6 nm谱线主要由F层的O^(+)和电子的辐射复合过程以及O^(+)和O^(-)的中性复合过程激发,该谱线强度和电离层峰值电子密度N_(m)F_(2)存在很强的相关性。利用夜气辉135.6 nm辐射强度与F_(2)层峰值电子密度N_(m)F_(2)的平方成正比的物理模型,建立了在不同经纬度、地方时、季节和太阳活动下均适用的反演算法。通过DMSP卫星上搭载的紫外光谱成像仪(SSUSI)实际观测的135.6 nm气辉辐射强度来反演相应时空的电离层F_(2)层临界频率f_(0)F_(2),并将其与地基测高仪探测结果做了综合对比。结果表明,在太阳活动高年(2013年),相对误差小于等于20%的数据占比93.0%,平均相对误差约为7.08%;在太阳活动低年(2017年),相对误差小于等于20%的数据占比80.8%,平均相对误差约为12.64%。最后,对该算法在太阳活动高低年的反演精度差异进行了分析。The ionosphere is the part of the upper atmosphere which is ionized by solar radiation.There are a variety of ground-based and space-based remote sensing and in situ instruments to study the ionosphere.Recently,an effective method,called passive optical remote sensing technique,is widely used to study the ionosphere.It utilizes natural airglow(atoms and molecules frequently emit light to shed their excess energy)in the ionosphere.In the electromagnetic spectrum,the far ultraviolet light emissions are prominent in the ionosphere and could be used to monitor the ionosphere.During the nighttime,the 135.6 nm spectral line is excited by the radiation recombination process of F region O+and e^(-)and the mutual neutralization process of O^(+)and O^(-)in the ionosphere.There is a strong correlation between the intensity of the spectral line and the maximum electronic density of ionospheric F_(2) layer(N_(m)F_(2)).Based on the physical model in which the OI 135.6 nm emission is proportional to the square of N_(m)F_(2),the retrieval algorithm is established for different longitude,latitude,local time,season and solar activity.In this paper,the critical frequency of ionospheric F_(2) region(f_(0)F_(2))is retrieved from 135.6 nm emission observed by the Special Sensor Ultraviolet Spectrographic Imager(SSUSI)instrument on board the Defense Meteorological Satellite Program(DMSP),and then the estimated results are compared with the detection results of ground-based ionosonde.As the results show,during the high-solar activity year(2013),the data with relative error less than or equal to 20% accounted for 93.0%,and the average relative error is about 7.08%.During the low-solar activity years(2017),the data with relative error less than or equal to 20% accounted for 80.8%,and the average relative error is about 12.64%.Finally,we analyze the difference of retrieval accuracy of the algorithm during the high and low solar activity years.

关 键 词：OI 135.6 nm 反演方法 f_(0)F_(2) 电离层 测高仪 

分 类 号：P352[天文地球—空间物理学]