Abstract
A mathematical model of the high-latitude F-region, taking the ionospheric plasma convection into account, is used for modeling a response of the auroral F-region to irradiation by powerful high-frequency (HF) radiowaves. The model enables us to calculate the time variations in the profiles of the electron concentration, the velocity of positive ions, and the ion and electron temperatures in the part of a magnetic-flux tube moving over an artificial ionospheric heater under the action of a convective electric field. The modeling was carried out for a part of the magnetic flux tube intersecting the F-layer irradiated by the Norwegian heater at Tromsö when it is located near the midnight magnetic meridian. The calculations were made for the equinox conditions under the high solar and low geomagnetic activity. The results of our modeling show that substantial variations in the profiles of the electron temperature, the velocity of positive ions, and the electron concentration can be produced in the nighttime high-latitude F-layer due to HF heating. The perturbation caused by a 20 s rectangular pulse should exist for about 20 min at the level of the F-layer maximum. The disturbed plasma volume can leave the region irradiated by the heater and move away for over 500 km within the above-mentioned time period.
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REFERENCES
Kapustin, I.N., Pertsovskii, R.A., Vasil'ev, A.N., et al., Radiation Generation at Combined Frequencies in the Auroral Electrojet Region, Pis'ma Zh. Eksp. Teor. Fiz., 1977, vol. 25, no. 5, p. 248.
Stubbe, P., Kopka, H., Lauche, H., et al., Ionospheric Modification Experiments in Northern Scandinavia, J. Atmos. Terr. Phys., 1982, vol. 44, no. 12, p. 1025.
Rietveld, M.T., Kopka, H., and Stubbe, P., D-Region Characteristics Deduced from Pulsed Ionospheric Heat-ing under Auroral Electrojet Conditions, J. Atmos. Terr. Phys., 1986, vol. 48, no. 4, p. 311.
Rietveld, M.T., Mauelshage, H.-P., Stubbe, P., et al., Characteristics of Ionospheric Heating Produced ELF/VLF Waves over 32 Hours, J. Geophys. Res., 1987, vol. 92, no. 8, p. 8707.
Belikovich, V.V., Benediktov, E.A., Getmantsev, G.G., et al., Radiowave Scattering by Artificial Disturbances of the F-Layer Ionosphere, Pis'ma Zh. Eksp. Teor. Fiz., 1975, vol. 22, no. 10, p. 497.
Mantas, G.P., Calrson, H.C., and LaHoz, C.H., Thermal Response of F-Region Ionosphere in Artificial Modification Experiments by HF Radio Waves, J. Geophys. Res., 1981, vol. 86, no. 2, p. 561.
Hansen, J.D., Morales, G.J., Duncan, L.M., and Dimonte, G., Large-Scale HF-Induced Ionospheric Modification: Experiments, J. Geophys. Res., A, 1992, vol. 97, no. 1, p. 113.
Shoucri, M.M., Morales, G.J., and Maggs, J.E., Ohmic Heating of the Polar F Region by HF Pulses, J. Geophys. Res., A, 1984, vol. 89, no. 5, p. 2907.
Hansen, J.D., Morales, G.J., and Maggs, J.E., Daytime Saturation of Thermal Cavitons, J. Geophys. Res., 1989, vol. 94, no. 6, p. 6833.
Knudsen, W.C., Magnetospheric Convection and the High-Latitude F2 Ionosphere, J. Geophys. Res., 1974, vol. 79, no. 7, p. 1046.
Heppner, J.P., Empirical Models of High-Latitude Electric Fields, J. Geophys. Res., 1977, vol. 82, no. 7, p. 1115.
Mingaleva, G.I. and Mingalev, V.S., Three-Dimensional Mathematical Model of Polar and Subauroral Ionosphere, in Modelirovanie protsessov v verkhnei polyarnoi atmosfere (Modeling the Processes in the Topside Polar Ionosphere), Murmansk: Polar. Geof. Inst., Kol'skii Nauch. Tsentr RAN, 1998, p. 251.
Blaunshtein, N.Sh., Vas'kov, V.V., and Dimant, Ya.S., Resonance Heating of the Ionosphere F-Layer by a Powerful Radio Wave, Geomagn. Aeron., 1992, vol. 32, no. 2, p. 95.
Mingaleva, G.I., Mingalev, V.S., and Krivilev, V.N., Causes of Increasing Electron Temperature in the Main Ionospheric Trough at the F-Layer Level, Geomagn. Aeron., 1990, vol. 30, no. 1, p. 153.
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Mingaleva, G.I., Mingalev, V.S. Modeling the Modification of the Nighttime High-Latitude F-Region by Powerful HF Radiowaves. Cosmic Research 40, 55–61 (2002). https://doi.org/10.1023/A:1014299902287
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DOI: https://doi.org/10.1023/A:1014299902287