Dependence of foF2 on Solar Activity Indices Based on the Data of Ionospheric Stations of the Northern and Southern Hemispheres

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Abstract

An analysis of the dependence of the F2-layer critical frequency on solar activity indices that has been started earlier based on the Juliusruh station data is continued. The data of six stations in the Northern Hemisphere and five stations in the Southern Hemisphere are analyzed in this paper. The determination coefficient R2 for the foF2 dependence on solar activity in each particular situation (station, month, local time) is taken as a measure of the quality of that dependence. The conclusion that a well-pronounced diurnal variation in R2 is observed in the winter months is confirmed for four solar activity proxies: this value is maximum and changes weakly in the daytime but decreases substantially to the nighttime hours. It is found that the F30 proxy is the best solar proxy to describe the foF2 behavior in the solar cycle, whereas the sunspot number Rz is the worst. Based on a comparison of the changes in R2 with LT in the same months at stations of the Northern and Southern hemispheres, it is shown that the aforementioned well-pronounced diurnal behavior in R2 is observed only in winter and is absent in summer

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About the authors

A. D. Danilov

Institute of Applied Geophysics

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

N. A. Berbeneva

Moscow State University

Email: adanilov99@mail.ru

Physical Faculty

Russian Federation, Moscow

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Supplementary files

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2. Fig. 1. Examples of daily variations of the R2 value for the Slough station.

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3. Fig. 2. Examples of daily variations of the R2 value for Moscow station.

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4. Fig. 3. Examples of daily variations of the R2 value for Alma-Ata stations.

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5. Fig. 4. Examples of the daily course of R2 for the Rz and F30 indices (art. Slough and Alma-Ata).

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6. Fig. 5. Examples of the daily course of R2 for the Rz and F30 indices (Moscow and Akita stations).

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7. Fig. 6. Changes in the value of R2 from LT in January and February to Boulder station.

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8. Fig. 7. Changes in the value of R2 from LT in January and February at the Ottawa station.

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9. Fig. 8. The change in the value of R2 from LT in January and February for the Port Stanley station.

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10. Fig. 9. The change in the value of R2 from LT in January and February for art. Concepcion.

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11. Fig. 10. The change in the value of R2 from LT for Australian stations.

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12. Fig. 11. The change in the value of R2 from LT for the station Johannesburg.

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13. Fig. 12. Change of R2 value from LT for Port Stanley and Hobart stations in June.

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