空间科学学报2017，Vol.37Issue(2)：158-167,10.DOI:10.11728/cjss2017.02.158
电离层中小尺度扰动的多频多普勒快速探测与分析
Multi-frequency Doppler Fast Detection and Analysis of Meso-micro Scale Ionospheric Disturbances
摘要
Abstract
Measuring the HF Doppler frequency shifts of ionospheric echoes is one of the important ways to study ionospheric disturbances.We use the real-time detection method based on measuring the phase-change rate of single frequency signals,and obtain continuous high-precision multifrequency Doppler ionograms to achieve fast detection and study of meso-micro scale ionosphcric disturbances.This method is applied to the multi-frequency detection system which is jointly developed by the Chinese Academy of Sciences and South-Central University for Nationalities.It is verified that the Doppler resolution obtained from this platform can be up to 0.039 Hz and the minimum ionogram period is less than 1 minute.We collect a long-time raw data of the ionosphere based on this new detection method and platform in Wuhan observatory.Through the way of acquiring high-precision Doppler frequency shifts and the method of inversing the normal velocity of electron concentration isosurface,the Doppler ionograms and vertical disturbed velocity of O waves are obtained.Furthermore,the real-time changes of ionospheric disturbances with time and space are deduced.By the spectrum analysis on these time domain signals,preliminary results show that these disturbances are mainly mesoscale TIDs motivated by the Polar activities which often appear in winter in central China.This paper also compares the three commonly used inversion methods.The results show that the ionospheric disturbances have almost the same change trends.It indicates that the observation data and the research methods are reliable and stable,which provides an important basis for observing and researching the multi-frequency and multi-point propagation characteristics of ionospheric disturbances.关键词
电离层中小尺度扰动/快速探测/多频探测系统/多普勒频移/电子浓度等值面法向运动速度Key words
Meso-micro scale ionospheric disturbances/Fast detection/Multi-frequency detection system/Doppler shift/Normal velocity of electron concentration isosurface分类
天文与地球科学引用本文复制引用
贺德江,朱正平,蓝加平,宁百齐,胡连欢..电离层中小尺度扰动的多频多普勒快速探测与分析[J].空间科学学报,2017,37(2):158-167,10.基金项目
国家自然科学基金项目资助(41474135,41127003,41134120) （41474135,41127003,41134120）
