海口站电离层闪烁强度功率谱分析与建模应用

基于中国海口站(20.00°N, 110.33°E)获取的2013全年UHF 频段电离层闪烁信号强度数据, 利用Welch算法, 分析给出了四类典型电离层闪 烁强度功率谱. 利用功率谱时序图分析方法, 发现电离层不均匀体存在东西向水 平周期性变化结构. 提取全年功率谱指数p, 通过统计分析发现谱指数p存在规律变化, 据此建立一个谱指数经验模型, 该谱指数模型已用于中国低纬 区域电离层闪烁发生预报概率模型(CMSOP), 进而对海口站UHF频段电离层闪烁发生 概率观测数据和预报结果进行了对比分析. 

Modeling and Analysis of the Power Sectra of Ionospheric Amplitude Scintillations over Haikou Station and Its Application

The amplitude data of UHF-band ionospheric scintillations were recorded at a low-latitude station of China, Haikou station (geographic: 20.00°N, 110.33°E), during the high sunspot activity year of 2013. Based on these data, the Welch algorithm of the Fast Fourier Transform methods was used to analyze the scintillation intensity power spectra, and four types of typical intensity power spectra were found and presented. A nearly sinusoidal fluctuation in the east-west horizontal direction was found in the irregularity structure by analyzing the contour map of spectral density as a function of local time and spatial scale. The spectral index p of the ionospheric amplitude scintillations was extracted for the year of 2013, and the variation of the spectral index p was analyzed by statistical method and an empirical model of the spectral index p over Haikou station was put forward, which was applied in the empirical Climatological Model of Scintillation Occurrence Probability (CMSOP) over the low-latitude of China. Finally the prediction of ionospheric scintillation occurrence over Haikou station from CMSOP is compared with the observations.