Articles | Volume 26, issue 9
https://doi.org/10.5194/acp-26-6243-2026
https://doi.org/10.5194/acp-26-6243-2026
Research article
 | 
11 May 2026
Research article |  | 11 May 2026

Variation characteristics of sporadic-E layer in East Asia based on long-term data

Hai-Sheng Zhao, Jie Feng, Yang Liu, Zheng-Wen Xu, Jian Wu, Kun Xue, Huai-Yun Peng, and Zong-Hua Ding

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Cited articles

Arras, C., Jacobi, C., and Wickert, J.: Semidiurnal tidal signature in sporadic E occurrence rates derived from GPS radio occultation measurements at higher midlatitudes, Ann. Geophys., 27, 2555–2563, https://doi.org/10.5194/angeo-27-2555-2009, 2009. 
Axford, W. I.: The formation and vertical movement of dense ionized layers in the ionosphere, J. Geophys. Res., 68, 769, https://doi.org/10.1029/JZ068i003p00769, 1963. 
Axford, W. I., Cunnold, D. M., and Gleeson, L. J.: Magnetic field changes in temperate zone sporadic-E layers, Planet. Space Sci., 14, 909–919, https://doi.org/10.1016/0032-0633(66)90096-1, 1966. 
Baggaley, W. J.: Three solar cycles of daytime southern hemisphere Es activity, J. Atmos. Terr. Phys., 46, 207, https://doi.org/10.1016/0021-9169(84)90147-8, 1984. 
Baggaley, W. J.: Changes in the frequency distribution of foEs and fbEs over two solar cycles, Planet. Space Sci., 33, 457, https://doi.org/10.1016/0032-0633(85)90089-3, 1985. 
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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.
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