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Abstract <p>Ground-based electron density measurements from ionosondes are used to evaluate the accuracy of ionospheric empirical models, such as the International Reference Ionosphere (IRI) and the NeQuick models. In the present study, the results obtained from ionosonde and empirical models (NeQuick2, IRI2016, and IRI2020) of the electron density at the Addis Ababa, Ethiopia ionosonde station, with a geographic latitude of 9.03° N and longitude 38.76° E on selected days in 2014 are presented. In the comparison of the NeQuick2, IRI2016, and IRI2020 models with the ionosonde data, the percentage deviation and the correlation coefficient (<i>R</i>) are used as measures of the performance of the models. The overall results show that the latest version of the IRI2020 model outperforms NeQuick2 and IRI2016 in ionospheric electron density value, with NeQuick2 showing slightly better performance than IRI2016. Mostly, the NeQuick2, IRI2016, and IRI2020 models show overestimation of the electron density values from the ionosonde data. The NeQuick2 model overestimates with a maximum percentage deviation of 38%; the IRI2016 model overestimates with a maximum percentage deviation of 40%; and the IRI2020 model overestimates with a maximum percentage deviation of 30% from the ionosonde data measurements, while underestimating with percentage deviations of 10, 18, and 9%, respectively. The average values of the correlation coefficients of the NeQuick2, IRI2016, and IRI2020 models are 0.79, 0.74, and 0.81, respectively.</p>

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Comparison of NeQuick and IRI Models with Ionosonde Data for Ionospheric Electron Density Measurements

  • 期刊论文

  • 发表日期：

    2025年2月1日

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  • Lake Endeshaw

摘要

Abstract

Ground-based electron density measurements from ionosondes are used to evaluate the accuracy of ionospheric empirical models, such as the International Reference Ionosphere (IRI) and the NeQuick models. In the present study, the results obtained from ionosonde and empirical models (NeQuick2, IRI2016, and IRI2020) of the electron density at the Addis Ababa, Ethiopia ionosonde station, with a geographic latitude of 9.03° N and longitude 38.76° E on selected days in 2014 are presented. In the comparison of the NeQuick2, IRI2016, and IRI2020 models with the ionosonde data, the percentage deviation and the correlation coefficient (R) are used as measures of the performance of the models. The overall results show that the latest version of the IRI2020 model outperforms NeQuick2 and IRI2016 in ionospheric electron density value, with NeQuick2 showing slightly better performance than IRI2016. Mostly, the NeQuick2, IRI2016, and IRI2020 models show overestimation of the electron density values from the ionosonde data. The NeQuick2 model overestimates with a maximum percentage deviation of 38%; the IRI2016 model overestimates with a maximum percentage deviation of 40%; and the IRI2020 model overestimates with a maximum percentage deviation of 30% from the ionosonde data measurements, while underestimating with percentage deviations of 10, 18, and 9%, respectively. The average values of the correlation coefficients of the NeQuick2, IRI2016, and IRI2020 models are 0.79, 0.74, and 0.81, respectively.