Trends in the F2-layer parameters based on the Sverdlovsk (Arti, 56 N) station data

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Abstract

Long-term variations (trends) in two parameters of the ionospheric F2 layer (foF2 and hmF2) based on the observations at the Sverdlovsk (Arti) ionospheric station and the calculated values of TEC over that station are analyzed. Five near-noon moments of LT are considered. Principal analysis is performed for three winter months, but for the sake of comparison, the values of the trends in foF2 and hmF2 for the spring month April, summer month July and fall month October are also presented. A confirmation of the existence of seasonal variations in the foF2 trends is obtained: negative trends are the strongest in winter. The obtained results agree with the results obtained earlier for midlatitude stations of the Northern and Southern hemispheres. No substantial seasonal variations are found for the hmF2 trends. Trends in the ТЕС values over the aforementioned station are also considered. It is demonstrated that there is a reasonable agreement between the relative trends (in percent) in foF2 и ТЕС.

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About the authors

A. D. Danilov

Fedorov Institute of Applied Geophysics

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

A. V. Konstantinova

Fedorov Institute of Applied Geophysics

Email: adanilov99@mail.ru
Russian Federation, Moscow

I. А. Ryabukhin

Bulashevich Institute of Geophysics

Email: adanilov99@mail.ru

Hermann and Robert Abels Laboratory–Observatory “Arti”

Russian Federation, Arti, Sverdlovsk oblast

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Supplementary files

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2. Fig. 1. Examples of ΔfoF2 changes over time for December.

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3. Fig. 2. Examples of ΔfoF2 changes over time for January.

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4. Fig. 3. Examples of ΔfoF2 changes over time for February.

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5. Fig. 4. Dependences of foF2 on SA indices for different years in January.

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6. Fig. 5. Dependences of foF2 on SA indices for different years in February.

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7. Fig. 6. Examples of ΔfoF2 changes over time for April and October.

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8. Fig. 7. Examples of changes in ΔhmF2 over time for December.

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9. Fig. 8. Examples of changes in ΔhmF2 over time for January.

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10. Fig. 9. Examples of changes in ΔhmF2 over time for February.

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11. Fig. 10. Examples of changes in ΔhmF2 over time for four months.

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12. Fig. 11. Examples of changes in ΔhmF2 over time for different time intervals in January and February.

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