VLBI studies of the solar-wind plasma irregularities at 18 and 92 CM wavelengths in 1994–1996

Altunin, V. I.; Dement'ev, A. F.; Lipatov, B. N.; Nechaeva, M.; Okmyanskiy, V. A.; Snegirev, S. D.; Tikhomirov, Yu. V.

doi:10.1007/bf02677181

Cited by 5 publications

(5 citation statements)

References 6 publications

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“…A prospective direction in this field of studies is supplementing the traditional radio-raying method by the interferometry method [5,21]. In [22,23], the application of radio interferometric methods for diagnostics of a turbulent nonstationary medium was considered in detail.…”

Section: Theorymentioning

confidence: 99%

Results of theoretical and experimental studies of solar wind and active galactic nuclei on LFVN VLBI network using S2 recording system

Gavrilenko

Nechaeva

Pushkarev

et al. 2007

Radiophys Quantum Electron

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UDC 520.274We discuss the results of two sessions of observations at the Low-Frequency VLBI Network (LFVN), carried out in 1999 (INTAS99.4) and 2000 (INTAS00.3) at a wavelength of 18 cm using the S2 recording system and processed using the correlator system in Pentictone, Canada. In different configurations of the experiments on studying the solar wind and active galactic nuclei, the antennas at the following sites were employed: Medvezhji . The work resulted in successful testing of the method of radio probing of the solar-wind plasma by radiation of extragalactic sources, supplemented with the method of radio interferometric reception. Spectral analysis of the obtained data allowed us to estimate the index of spatial spectrum of the electron number density fluctuations and the transfer velocity of the solar-wind inhomogeneities on the sounding path. We present and discuss the retrieved images of STA-102 quasar and the BL Lacertae object 1418+546 with millisecond angular resolution and demonstrate the results of modeling the structure of these sources.

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Section: Theorymentioning

confidence: 99%

Results of theoretical and experimental studies of solar wind and active galactic nuclei on LFVN VLBI network using S2 recording system

Gavrilenko

Nechaeva

Pushkarev

et al. 2007

Radiophys Quantum Electron

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“…In 1994-2000, seven multipurpose international sessions of VLBI observations of extragalactic radio sources and the Sun at frequencies of 327 and 1665 MHz were performed [45,46,55,56]. In the part of the experiment related to the diagnostics of the solar-wind plasma, the spatial region at the distances R > R from the Sun was studied (here R is the radius of the Sun).…”

Section: Vlbi Studies Of the Solar Windmentioning

confidence: 99%

“…It was shown that the influence of the inhomogeneities in the near-sun plasma on the operation of VLBI systems is significant in the range of angular distances from the Sun up to 30 • at a frequency of 1665 MHz and up to 80 • at a frequency of 327 MHz. In this case, the phase coherence of the signals is entirely violated if the probing path is close to the Sun, i.e., VLBI measurements are impeded at the distances less than 3 • (at a frequency of 1665 MHz) and less than 13 • (at a frequency of 327 MHz) [46,53].…”

Section: Vlbi Studies Of the Solar Windmentioning

confidence: 99%

VLBI studies at the Radiophysical Research Institute

Nechaeva

Antipenko

Dement'ev

et al. 2007

Radiophys Quantum El

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520.274We consider the state-of-the-art of research in the field of very long baseline interferometry (VLBI) at the Radiophysical Research Institute (Nizhny Novgorod, Russia). In the past decade, the team of the VLBI Laboratory at this institute used the extensive methodological and instrument basis and the accumulated experience of radio-interferometric observations to continue experimental and theoretical studies along several research lines including the studies of the solar wind and radio emission of the Sun, radar studies of the bodies in the solar system, and navigational measurements. We present the main experimental results obtained for the analyzed problems.

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“…The signal reception and transformation procedure employed in radio interferometry [4,8,9] permits one to single out the fluctuating phase difference of the signals received at separated points. Fluctuations of this phase difference are stipulated by the difference in the phase incursion on two neighboring paths.…”

Section: Introductionmentioning

confidence: 99%

“…Remote study of turbulent media is usually performed by the sounding method, in which the medium is rayed by standard signals and the distortions caused by inhomogeneities of the propagation medium are analyzed [1][2][3][4]. In particular, in recent years, much attention has been paid to acoustic sounding of turbulent liquids containing gas bubbles [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Interferometer study of the turbulent flow by noise-signal sounding

Gavrilenko

Кustov

Mart'yanov

et al. 2007

Radiophys Quantum Electron

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We consider the interferometer method by which a turbulent water flow is remotely studied by sounding with a noise ultrasound signal. It is shown that the processing of signals received by two spatially separated receivers makes it possible to extract the signal phase difference caused by the concentration fluctuations of cavity air bubbles on the propagation paths. Spectral analysis of the random phase difference permitted diagnostics of the propagation medium. In particular, it is shown that the output signal of the interferometer carries information on the spatial spectrum of parameter fluctuations of the medium, and on the velocity of inhomogeneities if the interferometer base is parallel to the turbulent flow.

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VLBI studies of the solar-wind plasma irregularities at 18 and 92 CM wavelengths in 1994–1996

Cited by 5 publications

References 6 publications

Results of theoretical and experimental studies of solar wind and active galactic nuclei on LFVN VLBI network using S2 recording system

Results of theoretical and experimental studies of solar wind and active galactic nuclei on LFVN VLBI network using S2 recording system

VLBI studies at the Radiophysical Research Institute

Interferometer study of the turbulent flow by noise-signal sounding

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