Abstract
We analyze ionospheric oblique sounding data on three high-latitude and one high-latitude–midlatitude HF radio paths for February 15 and 16, 2014, when two substorms and one magnetic storm occurred. We investigate cases of anomalous propagation of signals: their reflection from sporadic layer Es, lateral reflections, type “M” or “N” modes, the presence of traveling ionospheric disturbances, and the diffusivity of signals and triplets. The most significant results are the following. In geomagnetically undisturbed times, sporadic Es-layers with reduced maximum observed frequencies (MOFEs) on three high-latitude paths were observed in both days. The values of MOFEs during disturbances are large, which leads to the screening of other oblique sounding signals reflected from the ionosphere. On all four paths, the most frequently traveling ionospheric disturbances due to the terminator were observed in quiet hours from 03:00 to 15:00 UT on the first day and from 06:00 to 13:00 UT on the second day of the experiment. In addition, both the sunset terminator and the magnetic storm on the high-latitude–mid-latitude path were found to generate traveling ionospheric disturbances jointly. No such phenomenon was found on high-latitude paths.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Al’pert, Ya.L., Rasprostranenie elektromagnitnykh voln i ionosfera (Propagation of Electromagnetic Waves in the Ionosphere), Moscow: Nauka, 1972.
Blagoveshchenskii, D.V., Short Waves in Anomalous Radio Channels, Saarbrücken, Germany: LAP Lambert, 2011.
Davies, K., Ionospheric Radio Waves, Waltham, MA: Blaisdell, 1969; Moscow: Mir, 1973.
Hunsucker, R.D. and Hargreaves, J.K., The High-Latitude Ionosphere and Its Effects on Radio Propagation, Cambridge University Press, 2003.
MacDougall, J.W. and Jayachandran, P.T., Solar terminator and auroral sources for traveling ionospheric disturbances in the midlatitude F region, J. Atmos. Sol.–Terr. Phys., 2011, vol. 73, no. 11, pp. 2437–2443. doi 10.1016/j.jastp.2011.10.009
Pirog, O.M., Urbanovich, V.D., and Zherebtsov, G.A., Effects of substorms in the night auroral E-region, in Proceedings of the 5th International Conference on Substorms, St. Petersburg, 2000, pp. 545–547.
Razuvaev, O.I., Sporadic ionization in high-latitude geophysical studies, in Issledovaniya po geomagnetizmu, aeronomii i fizike Solntsa (Studies on Geomagnetism, Aeronomy, amd Solar Physics), Moscow: Nauka, 1991, vol. 93, pp. 3–16.
Vertogradova, E.G., Diagnostics, modeling, and prediction of the characteristics of decameter radio waves in naturally disturbed and artificially modified ionosphere, Cand. Sci. (Phys.–Math.) Dissertation, Rostov-on-Don: Southern Federal University, 2014.
Author information
Authors and Affiliations
Corresponding author
Additional information
Original Russian Text © D.V. Blagoveshchenskii, 2016, published in Geomagnetizm i Aeronomiya, 2016, Vol. 56, No. 4, pp. 479–488.
Rights and permissions
About this article
Cite this article
Blagoveshchenskii, D.V. Anomalous phenomena on HF radio paths during geomagnetic disturbances. Geomagn. Aeron. 56, 448–456 (2016). https://doi.org/10.1134/S0016793216040022
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1134/S0016793216040022