空间科学学报2025，Vol.45Issue(4)：975-986,12.DOI:10.11728/cjss2025.04.2024-0077
NeQuick G模型与COSMIC-2掩星数据在电离层层析算法中的使用
Use of NeQuick G Model and COSMIC-2 Occultation Data in Ionospheric Tomography Algorithm
尹萍 1张姗姗 1徐硕 1侯秀泽1
作者信息
- 1. 中国民航大学电子信息与自动化学院 天津 300300
- 折叠
摘要
Abstract
As effective means of ionospheric monitoring,NeQuick G model and Global Navigation Satellite System(GNSS)Constellation Observing System for Meteorology Ionosphere and Climate 2(COSMIC-2)have been providing plenty of information for characterizing ionospheric conditions.For ex-ample,the NeQuick G model is an empirical model that can offer estimated ionospheric electron density and Total Electron Content(TEC)data at any given time and location,while COSMIC-2 yields mea-sured electron density profiles via radio occultation techniques,thus providing direct observations of ver-tical ionospheric structures.With the development of ionospheric tomograhic techniques based on GNSS data,four-dimensional(spatio-temporal)distribution of electron density can be reconstructed globally even during periods of ionospheric disturbances.However,such tomographic techniques are often limited by uneven data coverage(non-uniform distribution of observation paths)and low vertical resolution in the inversion,which may reduce reconstruction accuracy.In this study,an improved three-dimensional ionospheric tomography approach is presented,adapting the Multi-Instrument Data Analysis System(MIDAS)algorithm to integrate NeQuick G model electron density profiles and COSMIC-2 occultation observations.By incorporating a background model and direct profile measurements,the tomography in-version receives additional constraints that help mitigate issues of data sparsity and improve vertical structure accuracy.Take a case study as an example,this improved MIDAS tomographic method is ap-plied to reconstruct the ionospheric electron density distribution over the Wuhan station(WU430),Chi-na and one South Korean station(JJ433)during the period of ionospheric disturbance between Novem-ber 3 and 4 in 2021.Besides,ionosonde observation data from these two stations are used as the inde-pendent measurements to evaluate the inversion results in term of peak electron density(NmF2)and peak height(hmF2)of the F2 layer,as well as electron density profiles.The comparsion results show that the improvement percentage of the Root Mean Squared Error(RMSE)of NmF2 tomographic results was up to 30.7%,and the RMSE improvement percentage of hmF2 tomographic results was up to 59.21%.关键词
NeQuick G模型/COSMIC-2掩星/电离层/层析算法Key words
NeQuick G model/COSMIC-2 occultation/Ionosphere/Tomographic algorithm分类
天文与地球科学引用本文复制引用
尹萍,张姗姗,徐硕,侯秀泽..NeQuick G模型与COSMIC-2掩星数据在电离层层析算法中的使用[J].空间科学学报,2025,45(4):975-986,12.
