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https://doi.org/10.5194/egusphere-2025-1524
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/egusphere-2025-1524
© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
13 Aug 2025
| 13 Aug 2025
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).
Variation characteristics of sporadic-E layer in East Asia based on long-term data
Abstract. The characteristics of ionospheric intensity, spatial distribution, diurnal variation, seasonal variation and long-term variation in East Asia are studied by using the ionospheric observation data from 21 ionosonde stations in China and Japan over the past 60 years. It is found that the Es layer intensity in East Asia is much higher than the global average, and the intensity center is located near the 30° N line, and weakens to low and high latitudes. At the same time, the intensity center of Es layer is not fixed, and the intensity center migrates with diurnal and seasonal variations. It is found that the regions with stronger Es showed a long-term downward trend, while the regions with weaker Es showed a long-term upward trend in East Asia.
How to cite. Zhao, H.-S., Feng, J., Liu, Y., Xu, Z.-W., Wu, J., Xue, K., Peng, H.-Y., and Ding, Z.-H.: Variation characteristics of sporadic-E layer in East Asia based on long-term data, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2025-1524, 2025.
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Hai-Sheng Zhao
School of Electronic Science and Technology, Hainan University, Haikou 570228, China
National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China
Yang Liu
National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China
Zheng-Wen Xu
National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China
Jian Wu
Kunming Electro-Magnetic Environment National Observation and Research Station, China Research Institute of Radiowave Propagation, Qujing 655500, China
Kun Xue
National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China
Huai-Yun Peng
National Key Laboratory of Electromagnetic Environment, China Research Institute of Radiowave Propagation, Qingdao 266107, China
Zing-Hua Ding
Kunming Electro-Magnetic Environment National Observation and Research Station, China Research Institute of Radiowave Propagation, Qujing 655500, China
Short summary
This study extensively investigates the characteristics of Es layer intensity, spatial distribution, diurnal variation, seasonal patterns, and long-term trends over East Asia, employing over 60 years of observational data from 21 ionosonde stations across China and Japan. The study reveals that sporadic E layer intensity over East Asia significantly exceeds the global average, with its intensity core centered along the 30° N latitude line and attenuating toward both lower and higher latitudes.
This study extensively investigates the characteristics of Es layer intensity, spatial...