Accuracy analysis of IRI2016 international reference ionosphere at altitude of 60~100 km

doi:10.11947/j.AGCS.2020.20180508

Abstract

Abstract: The low-altitude ionosphere (60~100 km) has great influence on radio propagation and measurement. IRI2016 is a widely used international reference ionospheric model. Therefore, it is of great practical significance to analyze the reliability of its electron density at an altitude of 60~100 km. Based on electron density data (2014-2016) provided by medium-frequency (MF) radar in Langfang, the reliability of electron density of IRI2016 model at an altitude of 60~100 km in the mid-latitude was quantitatively analyzed in this study using deviation, absolute difference, correlation coefficient, relative deviation and Lomb-Scargle periodogram. At the altitude of 60~100 km in the mid-latitude, the results showed as follows:① The deviation, absolute difference and relative deviation of electron density was closely related to season. At the altitude of 86~100 km, they increased rapidly with the increase of altitude. In addition, correlation coefficient was also closely related to season, but presented an alternation of increasing and decreasing with the increase of altitude. ② The electron density accuracy of the IRI2016 model was related to solar activity and geomagnetic conditions, and had the highest accuracy under low solar activity and magnetic tranquility. ③ The electron density of MF radar and IRI2016 model at the altitude of 82~84 km both showed significant (verified by 90% significance test) quasi-diurnal tidal wave and quasi-8-hour gravity wave. Meanwhile, IRI2016 model presented significant quasi-semidiurnal tidal wave, which was not found in MF radar. At the altitude of 86~92 km, the electron density of both MF radar and IRI2016 model had significant quasi-diurnal tidal wave and quasi-semidiurnal tidal wave, but no quasi-8-hour gravity wave. ④ The electron density of both MF radar and IRI2016 model showed differences in significant wave period and power spectrum at the same altitude, and the significant wave period and power spectrum had differences among different altitudes. ⑤ Quasi-diurnal tidal wave played a main role in the change of the electron density of both MF radar and IRI2016 model at the altitude of 82~92 km. Quasi-8-hour gravity wave played a secondary role at the altitude of 82 km, and quasi-semidiurnal tidal wave played a secondary role at the altitude of 86~92 km.

Key words: IRI2016 model, MF radar, electron density accuracy, Lomb-Scargle periodiagram

CLC Number:

P352

CHENG Huhua, ZHAN Caiju, ZHAO Liang, WANG Yibai, XIU Xingtao. Accuracy analysis of IRI2016 international reference ionosphere at altitude of 60~100 km[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(1): 42-54.

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