RADIO PHYSICS AND RADIO ASTRONOMY

PACS numbers: 94.20.dj 

Purpose: The regular and quasi-periodic diurnal and seasonal variations in the F2 region electron density N during the declining phase of the solar cycle in 2016.

Desing/methodology/approach: For the system spectral analysis of time variations N, the short-time Fourier transform, the adaptive Fourier transform, and the wavelet transform were used.

Findings: The dominant oscillation occurs with a period of 150÷260 min, amplitude of ΔN_a≈(0.4÷1.1)·10¹¹ m^-3,  and the amplitude of ΔN_a/Ñ≈0.09÷0.23 on a relative scale in the ionospheric F2 region over all seasons. This oscillation had temporal duration of 13 to 17 h, depending on the season. The amplitude of the oscillations with other periods was notably smaller.

Conclusions: The regular diurnal and seasonal variations and wave disturbances in the electron density at the F2 peak height during the ascending and declining phases of the solar cycle are generally close to and completely correspond to the existing concept of physical and chemical processes in the ionosphere.

Key words: ionosonde, diurnal and seasonal dependence, electron density, regular and quasi-periodic disturbances, system spectral analysis, wave disturbances 

Manuscript submitted 27.06.2017

Radio phys. radio astron. 2017, 22(3): 212-221

REFERENCES

1. DIKII, L. A., 1969. Theory of the Earth's Atmosphere Oscillations. Leningrad, USSR: Gidrometeoizdat Publ. (in Russian).

2. YEN, K. S. and LIU, C. H., 1972. Theory of ionospheric waves. New York, London: Academic Press.

3. BEER, T., 1974. Atmospheric waves. New York: Halsted Press.

4. GERSHMAN, B. N., 1974. Dynamics of the ionospheric plasma. Moscow, USSR: Nauka Publ. (in Russian).

5. GOSSARD, E. E. and HOOKE, W. H., 1975. Waves in the Atmosphere: Atmospheric Infrasound and Gravity Waves, Their Generation and Propagation (Developments in Atmospheric Science). Amsterdam, New York: Elsevier Scientific Pub. Co.

6. AVAKIAN, S. V., DROBZHEV, V. I., KRASNOV, V. M., KUDRIASHEV, G. S., LAZAREV, A. I., NIKOLAEV, A. G., RIAZANOVA, L. D., SEVASTIANOV, V. I. and IAKOVETS, A. F., 1981. Waves and Radiation in the Upper Atmosphere. Alma-Ata, USSR: Nauka Publ. (in Russian).

7. SOROKIN, V. M. and FEDOROVICH, G. V., 1982. Physics of Slow MGD Waves in the Ionospheric Plasma. Moscow, USSR: Energoizdat Publ. (in Russian).

8. DROBZHEV, V. I., ed. 1987. Wave-like disturbances in the ionosphere. Alma-Ata, USSR: Nauka Publ. (in Russian).

9. HINES, C. O., 1960. Internal gravity waves at ionospheric hights. Can. J. Phys. vol. 38, pp. 1441–1481. DOI: https://doi.org/10.1139/p60-150

10. TOLSTOY, I., 1967. Long–Period Gravity Waves in the Atmosphere. J. Geophys. Res. vol. 72, no. 18, pp. 4605–4622. DOI: https://doi.org/10.1029/JZ072i018p04605

11. CHIMONAS, G., 1970. Infrasonic waves generated by auroral currents. Planet Space Sci. vol. 18, is. 4, pp. 591–605. DOI: https://doi.org/10.1016/0032-0633(70)90134-0

12. YEN, K. C. and LIU, C. H., 1974. Acoustic gravity waves in the upper atmosphere. Rev. Geophys. vol. 12, is. 2, pp. 193–216. DOI: https://doi.org/10.1029/RG012i002p00193

13. FRANCIS, S. H., 1974. A Theory of Medium-Scale Travelling Ionospheric Disturbances. J. Geophys. Res. Space Phys. vol. 79, is. 34, pp. 5245–5260. DOI: https://doi.org/10.1029/JA079i034p05245

14. FRANCIS, S. H., 1975. Global propagation of atmospheric gravity waves: A review. J. Atmos. Terr. Phys. vol. 37, is. 6-7, pp. 1011–1054. DOI: https://doi.org/10.1016/0021-9169(75)90012-4

15. GRIGOR'EV, G. I. and CHUNCHUZOV, E. P., 1975. Acoustic-gravity waves in the atmosphere. In: The polar aurora and luminescence of the night sky. Moscow, USSR: Nauka Publ. no. 23, pp. 5–21 (in Russian).

16. PONOMAREV, E. A. and ERUSHCHENKOV, A. I., 1977. Infrasonic waves in the Earth's atmosphere (review). Radiophys. Quantum Electron. vol. 20, is. 12, pp. 1218–1229.

17. WILLIAMS, P. J. S., 1996. Tides, atmospheric gravity waves and traveling disturbances in the ionosphere. In: Modern ionospheric science. A collection of articles published on the occasion of the anniversary: "50 years of ionospheric research in Lindau". Kaltenburg-Lindau: EGP, pp. 136–180.

18. GRIGOR'EV, G. I., 1999. Acoustic-gravity waves in the earth's atmosphere (review). Radiophys. Quantum Electron. vol. 42, no. 1, pp. 1–21. DOI: https://doi.org/10.1007/BF02677636

19. LYTVYNENKO, L. N. and YAMPOLSKI, YU. M., eds., 2005. Electromagnetic manifestations of geophysical effects in Antarctica. Kharkiv: IRA NAS of Ukraine, NASCU MES of Ukraine Publ. (in Russian).

20. BURMAKA, V. P., TARAN, V. I. and CHERNOGOR, L. F., 2005. The results of investigation of wave-like disturbances in the ionosphere by incoherent scattering technique. Uspekhi sovremennoi radioelektroniki. no. 3, pp. 4–35 (in Russian).

21. BURMAKA, V. P., TARAN, V. I. and CHERNOGOR, L. F., 2006. Wave-Like Processes in the Ionosphere under Quiet and Disturbed Conditions. 1. Kharkov Incoherent Scatter Radar Observations. Geomagn. Aeron. vol. 46, is. 2, pp. 183–198. DOI: https://doi.org/10.1134/S0016793206020071

22. BURMAKA, V. P., TARAN, V. I. and CHERNOGOR, L. F., 2006. Wave-Like Processes in the Ionosphere under Quiet and Disturbed Conditions. 2. Analysis of Observations and Simulation. Geomagn. Aeron. vol. 46, no. 2, pp. 199–208. DOI: https://doi.org/10.1134/S0016793206020083

23. CHERNOGOR, L. F. and BARABASH, V. V., 2012. Wave Disturbances of Electron Density in Ionospheric F2 Layer: Seasonal–Diurnal Variations. Radio Phys. Radio Astron. vol. 17, no. 4, pp. 353–361 (in Russian).

24. CHERNOGOR, L. F., GARMASH, K. P., PODNOS, V. A. and TYRNOV, O. F. 2013. The V. N. Karazin Kharkiv National University Radio physical Observatory – the tool for ionosphere monitoring in space experiments. In: S. A. Zasukha, O. P. Fedorov, eds. Space Project "Ionosat-Micro". Kyiv, Akademperiodika Publ., pp. 160–182 (in Russian).

25. CHERNOGOR, L. F., 2008. Advanced Methods of Spectral Analysis of Quasiperiodic Wave-Like Processes in the Ionosphere: Specific Features and Experimental Results. Geomagn. Aeron. vol. 48, is. 5, pp. 652–673. DOI: https://doi.org/10.1134/S0016793208050101

26. BRUNELLI, B. E. and NAMGALADZE, A. A., 1988. Physics of the ionosphere. Moscow, USSR: Nauka Publ.

27. SCHUNK, R. W. and NAGY, A. F., 2000. Ionospheres: physics, plasma physics, and chemistry. In: J. T. HOUGHTON, M. J. RYCROFT, A. J. DESSLER, eds. Cambridge atmospheric and space since series. Cambridge: Cambridge University Press. DOI: https://doi.org/10.1017/CBO9780511551772

28. LYASHENKO, M. V., PULYAEV, V. A. and, CHERNOGOR, L. F., 2006. Diurnal and seasonal variations of ionospheric plasma parameters during rise solar activity record. Kosmіchna nauka і tekhnologіya. vol. 12, no. 5/6, pp. 58–68 (in Russian).

 

 

 

ionosonde; diurnal and seasonal dependence; electron density; regular and quasi-periodic disturbances; system spectral analysis; wave disturbances