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Frolov V. L. Kagan L. M. Komrakov G. P. Sergeev E. N. Shorokhova E. A. 《Radiophysics and Quantum Electronics》2002,45(12):917-928
We present the results of experiments on modification of the sporadic E-layer of the Earth's ionosphere by a powerful vertical beam of HF radio waves. The experiments were performed at the Sura heating facility (Radiophysical Research Institute, Nizhny Novgorod) from May 31 to June 4, 2001. The main results were obtained in May 31 from 17:30 to 20:00 MSK, when the Es layer was fairly stable and the pump frequency was in the range where this layer was transparent. The diagnostics of the ionosphere was performed using X-mode probe waves in the frequency range fpr=4.3-7.8 MHz. The ionosphere plasma heating was accompanied by an increase in the intensity of probe waves, reflected from the Es layer, with frequencies close to or slightly higher than the critical frequency of the layer. Artificial fluctuations of the reflected signal appeared in the entire frequency range of sounding. We consider the dynamical characteristics of the observed phenomena and their dependence on the frequency fpr and the parameters of the Es layer. 相似文献
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E. N. Sergeev S. M. Grach G. P. Komrakov V. L. Frolov P. Stubbe B. Thidé T. Leyser T. Carozzi 《Radiophysics and Quantum Electronics》1999,42(7):544-556
We present the results of experimental studies of the evolution of stimulated electromagnetic emission of the ionosphere (SEE)
under the F-layer modification by powerful HF radio waves in a broad range of the pump wave frequencies. We compare the parameters
of the overshoot effect in SEE evolution to the observations of anomalous attenuation and field-aligned scattering of radio
waves. We show the overshoot effect to result from the anomalous attenuation under scattering at artificial small-scale ionospheric
irregularities. We found the characteristic time scales of the overshoot effect development to decrease and its value to increase
as the pump wave frequency decreases from 6 to 4 MHz; this is attributed to the observed increase of the irregularities amplitude
at scales
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 42, No. 7, pp. 619–634, July 1999. 相似文献
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Kagan LM Nicolls MJ Kelley MC Carlson HC Belikovich VV Bakhmet'eva NV Komrakov GP Trondsen TS Donovan E 《Physical review letters》2005,94(9):095004
We report the discovery of radio-wave-induced red emission of OH Meinel rotation-vibrational bands at 629.79 nm. These are the first measurements of artificial aurora below 100 km. We believe that the 629.79-nm OH emission was due to radio-wave focusing by sporadic ionization clouds near 80-85 km altitude, thus giving a technique to visualize the low-altitude sporadic ionization and providing insight into ionospheric interactions at these low altitudes. 相似文献
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V. O. Rapoport N. A. Mityakov V. A. Zinichev G. P. Komrakov N. A. Ryzhov Yu. A. Sazonov 《Radiophysics and Quantum Electronics》2005,48(1):29-33
This paper presents the results of measurement of the electrical field generated by a high-power acoustic signal in the atmosphere (electro-acoustic sounding). The radiated acoustic power was about 1 kW. The acoustic-signal frequency varied linearly within the interval 17–21 Hz with a period of 8 min. The electric field was registered by a -shaped antenna. The results of processing of the electric-field records for a part of sessions indicate the presence of an electric response with frequency close to the acoustic-signal frequency. The signal amplitude at the input of the receiving device was 0.1–1 µV.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 48, No. 1, pp. 33–37, January 2005. 相似文献
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Tokarev Yu. V. Alimov V. A. Komrakov G. P. Boiko G. N. Rietveld M. T. Rodriguez P. Bougeret J.-L. Kaiser M. L. Goetz K. 《Radiophysics and Quantum Electronics》2001,44(10):751-762
Results of the 1999 experiments on receiving radio-frequency signals from the SURA and EISCAT facilities on the WIND spacecraft at 5475 kHz are presented. Power and frequency distortions imposed by near-Earth plasmas on the response of SURA-EISCAT, an active decameter radio interferometer with a superlong baseline of 2000 km, are studied. Quasi-oscillatory variations in the intensity of the received radiation with a period of several tenths of a second and the corresponding maximum in the intensity fluctuation spectrum are observed during synchronized operation of the facilities under both quiet and perturbed geophysical conditions including the occurrence of mid-latitude F spread. Variations in the mean frequency of the spectral line both because of the motion of the spacecraft and the large-scale traveling ionospheric disturbances are detected. The obtained results are compared with the modern theoretical concept of propagation of short radio waves in a randomly irregular ionospheric plasma. The possibility to realize the limiting angular resolution of a ground-based decameter interferometer with a superlong baseline for observations of discrete space radio sources is discussed. 相似文献