Results of Russian experiments dealing with the impact of powerful HF radiowaves on the high-latitude ionosphere using the EISCAT facilities
We present the results of complex experiments dealing with the impact of powerful HF radiowaves on the high-latitude ionosphere using the European Incoherent Scatter Scientific Association (EISCAT) facilities. During the ionospheric F-region heating by powerful extraordinary (X-mode) polarized HF radiowaves under the conditions of heating near the critical fH frequency fH ≈ fxF2 of the extraordinary wave of the F2-layer, we were first to detect the excitation of intense artificial small-scale ionospheric irregularities (ASIs), accompanied by electron temperature increases by approximately 50%. The results of coordinated satellite and ground-based observations of the powerful HF radiowave impact on the high-latitude ionosphere are considered. During ionospheric F-region heating by powerful HF radiowaves of ordinary polarization (O-mode) during evening hours, the phenomenon of ion outflow accompanied by electron temperature increases and thermal plasma expansion was revealed. Concurrent DMSP-F15 satellite measurements at a height of about 850 km indicate an O+ ion density increase. The CHAMP satellite observations identified ULF emissions at the modulation frequency (3 Hz) of the powerful HF radiowave, generated during modulated emissions of the powerful HF radiowave of O-polarization and accompanied by a substantial increase in the electron temperature and ASI generation.
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- Avdeev, V.B., Belei, V.S., Belenov, A.F., et al., Overview of Results Dealing with Scattering of HF Signals on Artificial Plasma Turbulence, Obtained Using a UTR-2 Radio Telescope, Izv. Vyssh. Uchebn. Zaved., Radiofiz., 1994, vol. 37, pp. 479–492.Google Scholar
- Blagoveshchenskaya, N.F., Geofizicheskie Effekty Aktivnykh Vozdeistvii V Okolozemnom Kosmicheskom Prostranstve (Geophysical Effects due to Active Impacts in Near Space), St. Petersburg: Gidrometeoizdat, 2001, p. 287.Google Scholar
- Erukhimov, L.M., Metelev, S.A., Artificial Ionospheric Turbulence: Overview, Izv. Vyssh. Uchebn. Zaved. Radiofiz., 1987, vol. 30, pp. 208–226.Google Scholar
- Getmantsev, G.G., Zuikov, N.S., Kotik, D.S., et al., Detection of Raman Frequencies during Interaction of Powerful High-Frequency Radiation with Ionospheric Plasma, Pis’ma Zh.ETF, 1974, vol. 20, pp. 229–232.Google Scholar
- Grach, S.M. and Karashtin, A.N., Mityakov et al., Thermal Parametric Instability in Inhomogeneous Plasma: Nonlinear Theory, Fiz. Plazmy, 1978, vol. 4, pp. 1330–1340.Google Scholar
- Gurevich, A.V. and Shvartsburg, A.B., Nelineinaya teoriya rasprostraneniya radiovoln v ionosfere (Nonlinear Theory of Radiowave Propagation in the Ionosphere), Moscow: Nauka, 1973, p. 276.Google Scholar
- Ivanov, V.A., Ignat’ev, Yu.A., Frolov, V.A., et al., Focusing Properties of an Artificial Large-Scale Disturbance Region on a 25-km Path, Geomagn. Aeron., 1986, vol. 26, pp. 328–334.Google Scholar
- Milikh, G.M., Papadopoulos, K., McCarric, M., and Preston, J., ELF Emission Generated by the HAARP HF Heater Using Varying Frequency and Polarization, Izv. Vyssh. Uchebn. Zaved., Radiofiz., 1999, vol. 42, pp. 728–735.Google Scholar
- Vas’kov, V.V. and Gurevich, A.V., Nonlinear Resonance Instability of Plasma in the Field of an Ordinary Electromagnetic Wave, Zh. Eksp. Teor. Fiz., 1975, vol. 69, pp. 176–188.Google Scholar