Excitation of Langmuir and Ion–Acoustic Turbulence in the High-Latitude Ionosphere by a High-Power HF Radio Wave Simultaneously Below and Above the F2-Layer Maximum
| Autor: | T. D. Borisova, Michael T. Rietveld, N. F. Blagoveshchenskaya, A. S. Kalishin, M. I. Häggström |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Nuclear and High Energy Physics Incoherent scatter Astronomy and Astrophysics Statistical and Nonlinear Physics Plasma 01 natural sciences F region Spectral line 010305 fluids & plasmas Electronic Optical and Magnetic Materials Computational physics Ion Physics::Space Physics 0103 physical sciences Electrical and Electronic Engineering Ionosphere 010306 general physics Excitation Radio wave |
| Zdroj: | Radiophysics and Quantum Electronics. 62:793-806 |
| ISSN: | 1573-9120 0033-8443 |
| DOI: | 10.1007/s11141-020-10025-z |
| Popis: | We present the results of experimental studies of the generation peculiarities and features of the Langmuir and ion–acoustic turbulence in the F region of the high-latitude ionosphere excited by high-power HF O-mode radio waves emitted by the EISCAT/Heating facility (Tromso, Norway) in the direction of the Earth’s magnetic field. The experiment was carried out at frequencies fH close to the fourth gyroharmonic, fH < 4fce, and the cutoff frequency of the F2 layer, foF2 , fH < foF2 < fH+fce/2, where fce is the electron gyrofrequency. By using the EISCAT incoherent scatter radar (930 MHz), a joint analysis of the plasma and ion line spectra simultaneously below and above the F2-layer maximum was performed. The excitation of the HF-induced plasma lines outshifted by 0.35–0.45 MHz from the pump-wave frequency and HF-enhanced ion lines simultaneously below and above the F2-layer maximum was found for the first time. The mechanisms of the pump-wave propagation to altitudes above the F2-layer maximum and a plausible mechanism for the excitation of the instability responsible for the generation of HF-enhanced ion lines and HF-induced plasma lines above the F2-layer maximum are discussed. |
| Databáze: | OpenAIRE |
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