Ionospheric disturbance analysis of the January 15,2022 Tonga eruption based on GPS data  

作　　者：Jiafeng LI Kejie CHEN Haishan CHAI Jian LIN Zhiyuan ZHOU Hai ZHU Mingzhe LYU 

机构地区：[1]Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen 518055,China [2]Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China

出　　处：《Science China Earth Sciences》2023年第8期1798-1813,共16页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 42074024, 41890813 & 41976066);the Young Talent Promotion Project of the China Association for Science and Technology。

摘　　要：Hunga Tonga-Hunga Ha’apai climactic eruption on January 15,2022,released enormous energy that affected the ionosphere over the Pacific Rim.We analyzed ionospheric disturbance following volcanic eruptions using near-field(<1000 km),regional(1000–5000 km),and far-field(5000–12000 km) global positioning system(GPS) observations.The results indicate that the near-field ionospheric perturbation that occurred 8–15 min after the cataclysmic eruption was mainly derived from the shock wave(~1000 m/s) generated by the blast,while the low-frequency branch with long-distance propagation characteristics over the regional and the far-field was mainly associated with atmospheric Lamb waves(~330 m/s).Moreover,the amplitude of disturbance and background total electron content(TEC) are related proportionally.The intensity of the volcanic eruption and the background ionospheric conditions determine the magnitude of ionospheric responses.TEC perturbations were invisible on the reference days.Furthermore,the source location and onset time were calculated using the ray tracing technique,which confirms that the Tonga event triggered the ionospheric anomaly beyond the crater.Finally,the change in the frequency of the perturbations coincided with the arrival of the initial tsunami,implying the generation of a meteotsunami.

关 键 词：GPS Tonga volcano Traveling ionospheric disturbances RAYTRACING Meteotsunami 

分 类 号：P317.3[天文地球—固体地球物理学] P352[天文地球—地球物理学]