WebKey Points. The amplitude of annual and solar cycle oscillations are predominant in peak frequencies, and altitude of the E-and F-region, respectively. In the E-region, daytime foEs shows a weak negative trend −2.00 ± 0.61 kHz/yr during 1964–2024. Day and nighttime F-region critical frequency, and peak height trends are negative.
Journal of Physics D: Applied Physics - IOPscience
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New Journal of Physics - IOPscience
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