Changes with Time in the Relation Between the F2-Layer Critical Frequency and Height

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Abstract

The change with time in the parameter S that characterizes the relation of the critical frequency foF2 to the height hmF2 of the ionospheric F2 layer is considered. The results of measurements by the vertical sounding method at two stations Moscow and Juliusruh are analyzed. The dependence of foF2 on hmF2 is drawn for three intervals: 1957–1980, 1996–2023, and 2011–2023. Five near-noon LT moments and two seasons (winter (January and February) and summer (June and July)) are considered. It is found for both stations and both seasons that the S value is increasing systematically from the earlier to later periods. At the same time, the winter S values are approximately by a factor of three higher than the summer ones for all periods. It is suggested that the found changes in the parameter S could provide valuable information on long-term variations (trends) in thermospheric parameters with the help of current theoretical models of the TIEGCM or WACCM-X type.

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About the authors

A. D. Danilov

Institute of Applied Geophysics

Author for correspondence.
Email: adanilov99@mail.ru
Russian Federation, Moscow

A. V. Konstantinova

Institute of Applied Geophysics

Email: adanilov99@mail.ru
Russian Federation, Moscow

N. A. Berbeneva

Physical Faculty of the Moscow State University

Email: adanilov99@mail.ru
Russian Federation, Moscow

References

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Supplementary files

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2. Fig. 1. Examples of changes in foF2 with hmF2 for January (Art. Moscow).

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3. Fig. 2. Examples of changes in foF2 with hmF2 for February (Art. Moscow).

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4. Fig. 3. Examples of foF2 variation with hmF2 for summer months (st. Moscow).

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5. Fig. 4. Examples of foF2 variation with hmF2 for winter months (v. Juliusruh).

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6. Fig. 5. Examples of foF2 variation with hmF2 for June (v. Juliusruh).

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