Irkutsk, Russian Federation
Irkutsk, Russian Federation
The paper presents a method of interpreting data on oblique ionosphere sounding (OS) with a continuous chirp signal. Hybrid algorithms for automatic interpretation of ionograms by selected points with significant amplitude obtained during secondary data processing for various heliogeophysical conditions have been developed and implemented. For the conditions of the two-layer ionosphere, an interpretation method has been worked out which involves analyzing histograms for the distribution of points with significant amplitude, which fall into a model mask constructed from the results of modeling of the distance-frequency characteristic for propagation when it moves over the ionogram. For the multilayer ionosphere, the interpretation is based on the study of the ionogram amplitude relief. The algorithms for extracting tracks of signals reflected from sporadic layers are examined separately. We report the results of interpretation of ionograms obtained on the network of chirp sounding radio paths in the northeastern region of Russia.
ionosphere, ionogram, radio wave propagation, oblique ionosphere sounding
1. Blagoveshchensky D.V., Zhbankov G.A., Maltseva O.A. Observed and calculated ionograms of oblique ionospheric sounding on HF radio paths during a magnetic storm of September 7–8, 2017. Radiophysics and Quantum Electronics. 2019, vol. 61, no. 12, pp. 881–892.
2. Davies K. Ionospheric Radio Waves. Blaisdell, London, 1969, 460 p.
3. Dvinskikh, N.I. Expansion of ionospheric characteristics fields in empirical orthogonal functions. Adv. Space Res. 1988, vol. 8, no. 4, pp.179–187. DOI:https://doi.org/10.1016/0273-1177(88)90238-4.
4. Grozov V.P., V.I. Kurkin, V.E. Nosov, Ponomarchuk S.N. An interpretation of data oblique-incidence sounding using the chirp-signal. Proceedings of ISAP`96, Chiba, Japan. 1996, pp. 693–696.
5. Grozov V.P., Ilyin N.V., Kotovich G.V., Ponomarchuk S.N. Software system for automatic interpretation of ionosphere sounding data. Pattern Recognition and Image Analysis. 2012, vol. 22, no. 3, pp. 458–463.
6. Ilyin N.V., Bubnova T.V., Grozov V.P., Penzin M.S., Ponomarchuk S.N. Real-time forecast of MUF for radio paths from current data obtained from oblique sounding with continuous chirp signal. Solar-Terr. Phys. 2018, vol. 4, iss. 3, pp. 83–91. DOI:https://doi.org/10.12737/szf-43201811.
7. Ivanov V.A., Ryabova N.A., Shumaev V.V., Uryadov V.P. Forecasting and updating HF channel parameters on the basis of oblique chirp sounding. Radio Sci. 1997, vol. 32, no. 3, pp. 983–988.
8. Ivanov V.A., Kurkin V.I., Nosov V.E., Uryadov V.P., Shumaev V.V. Chirp ionosonde and its application in the ionospheric research. Radiophysics and Quantum Electronics. 2003, vol. 46, iss. 11, pp. 821–851.
9. Kotovich G.V., Kim A.G., Mikhailov S.Ya., Grozov V.P., Mikhailov Ya.S. Determining the foF2 critical frequency at the path midpoint from oblique sounding data based on the Smith method. Geomagnetism and Aeronomy. 2006, vol. 46, no. 4, pp. 517–521.
10. Krasheninnikov I.V., Liannoy B.E. Estimation of the true ionospheric height profile, with a continuous gradient, from oblique sounding data. J. Atmos. Terr. Phys. 1990, vol. 52, no. 2. pp. 113–117.
11. Kurkin V.I., Nosov V.E., Matyushonok S.M., Litovkin G.I., Ivanov V.L., Shumaev V.V., et al. The features of round-the-world signal propagation over the paths of the Russian chirp-sounder network during low and mild solar activity. Radiophysics and Quantum Electronics. 2000, vol. 43, iss. 10, pp. 755–765.
12. Kurkin V.I., Pirog O.M., Polekh N.V., Mikhalev A.V., Poddelsky I.N., Stepanov A.E. Ionospheric response to geomagnetic disturbances in the north-eastern region of Asia during the minimum of 23rd cycle of solar activity. J. Atmos. Solar-Terr. Phys. 2008, vol. 70, no. 18, pp. 2346–2357. DOI:https://doi.org/10.1016/j.jastp.2008.09.022.
13. Kurkin V.I., Medvedeva I.V., Podlesnyi A.V. Effect of sudden stratosphere warming on characteristics of medium-scale traveling ionospheric disturbances in the Asian region of Russia. Adv. Space Res. 2024, vol. 73, no. 7, pp. 3613–3623. DOI:https://doi.org/10.1016/j.asr.2023.09.020.
14. Mikhailov S.Y., Grozov V.P. Recovery of the Nonmonotonic Altitude Profile of the Plasma Frequency Based on the Ionospheric Oblique Sounding Data. Radiophysics and Quantum Electronics. 2013, vol. 56, iss. 7, pp. 399–412.
15. Penzin M.S., Ponomarchuk S.N., Grozov V.P., Kurkin V.I. Real-time techniques for interpretation of ionospheric backscatter sounding data. Radio Sci. 2019, vol. 54, iss. 5, pp. 480–491. DOI:https://doi.org/10.1029/2018RS006656.
16. Podlesnyi A.V., Brynko I.G., Kurkin V.I., Berezovskii V.A., Kiselev A.M., Petukhov E.V. Multifunctional chirp ionosonde for monitoring the ionosphere. Geliogeofizicheskie issledovaniya [Heliogeophys. Res.]. 2013, no. 4, pp. 24–31. (In Russian).
17. Podlesnyi A.V., Lebedev V.P., Ilyin N.V., Khahinov V.V. Implementation of the method for restoring the transfer function of the ionospheric radio channel based on the results of sounding the ionosphere with a continuous chirp signal. Electromagnetic waves and electronic systems. 2014, vol. 19, no. 1, pp. 63–70. (In Russian).
18. Ponomarchuk S.N., Grozov V.P., Kotovich G.V., Mikhailov S.Ya. The processing and interpretation of vertical and oblique sounding ionograms for ionosphere diagnostics on the base of chirp - ionosonde. Bull. Siberian State Aerospace University named after. acad. M.F. Reshetneva, 2013, no. 5 (51), pp. 163–166.
19. Ponomarchuk S.N., Grozov V.P., Kim A.G., Kotovich G.V., Podlesniy A.V. The near real-time diagnostics of ionosphere parameters at the middle point of the radio path on the base of oblique sounding data.Proc. of SPIE. 2015, vol. 9680, 96805E. DOI:https://doi.org/10.1117/12.2203589.
20. Song H., Hu Y., Jiang C., Zhou C., Zhao Z., Zou X. An automatic scaling method for obtaining the trace and parameters from oblique ionogram based on hybrid genetic algorithm. Radio Sci. 2016, vol. 51, no 12, pp. 1838–1854. DOI: 10.1002/ 2016RS005987.
21. Vertogradov G.G., Uryadov V.P., Vertogradova E.G. Calculation of optimal operating frequencies of a communication radio line according to oblique ionosphere sounding. Radiophysics and Quantum Electronics. 2008, vol. 51, iss. 1, pp. 9–19.
22. Uryadov V.P., Kurkin V.I., Vertogradov G.G., Vertogradov V.G., Ponyatov A.A., Ponomarchuk S.N. Features of propagation of HF signals on mid-latitude paths under conditions of geomagnetic disturbances. Radiophysics and Quantum Electronics. 2004, vol. 47, no.12, pp. 933–946.
23. URL: http://ckp-rf.ru/ckp/3056/ (accessed January 15, 2024).
