Saturn Electrostatic discharges (SED) are sporadic broadband impulsive radio bursts associated wi... more Saturn Electrostatic discharges (SED) are sporadic broadband impulsive radio bursts associated with lightning in Saturnian atmosphere. After 25 years of space investigations in 2006 the first successful observations of SED on the UTR-2 radio telescope were carried out [1]. Since2007 along-term program of ED search and study in the Solar system has started. As a part of this program the unique observations with high time resolution were taken in 2010. New possibilities of UTR-2 radio telescope allowed to provide a long-period observations and study with high temporal resolution. This article presents the results of SED study in a wide range of time scales: from seconds to microseconds. For the first time there were obtained a low frequency spectrum of SED. We calculated flux densities of individual bursts at the maximum achievable time resolution. Flux densities of most intensive bursts reach 4200 Jy.
Purpose: The results of research in continuum decameter-wave radio emission of the Galaxy backgro... more Purpose: The results of research in continuum decameter-wave radio emission of the Galaxy background, ionized hydrogen regions, supernova remnants, extragalactic discrete sources, extended galaxies, galactic clusters, extragalactic background are given. The aim of this work is reviewing the results achieved for over 50-years of the UTR-2 radiotelescope research of our Galaxy and its population, as well as extragalactic radio sources in the continuum radio emission spectrum at extremely low frequencies for the ground based observations. Design/methodology/approach: The review, analysis, collection of archival data in various publications related to the subjectof this work. Findings: The basic results of studying the ionized hydrogen regions, supernova remnants, Galaxy background emission and its large-scale structure are given, and the maps of these sources are obtained. The catalog of extragalactic discrete radio sources of the most Northern sky part and the cosmological conclusions...
2015 International Conference on Antenna Theory and Techniques (ICATT), 2015
ABSTRACT The low frequency radio astronomy (decameter-meter range, frequencies of 10-300 MHz) cur... more ABSTRACT The low frequency radio astronomy (decameter-meter range, frequencies of 10-300 MHz) currently demonstrates rapid progress all over the world. New generations of large antennas-LOFAR, LWA, MWA and others – have been created in many countries. At the same time Ukrainian radio astronomical systems UTR-2 and URAN still remain the largest and most informative ones at the lowest frequency range available for the ground-based radio astronomy (below 33 MHz), especially after their radical modernization during the most recent years. A great number of top priority results have been obtained on the basis of these radio telescopes. The results prove a high significance of the low frequency radio astronomy for astrophysics. Substantial part of these results have been obtained in the course of many year cooperation between Ukraine on one side and France, Austria, Germany and other countries on the other. Creation of new low frequency instruments GURT (Ukraine) and LSS/NenuFAR (France) for the wide frequency range of 10-80 MHz opens up new possibilities for research and fruitful cooperation.
The positive possibilities of astrophysical objects studies(including the Solar system investigat... more The positive possibilities of astrophysical objects studies(including the Solar system investigations) using coordinated observations with the largest existing and coming low frequency radio telescopes are shown. The observations of the Sun, Jupiter, Saturn, ant others with UTR-2, URAN, NDA radio telescopes, and WIND, Cassini and STEREO space missions at frequencies lower than 40 MHz have been carried out.
ABSTRACT Successful ground-based detection of Saturn's lightning despite terrestrial inte... more ABSTRACT Successful ground-based detection of Saturn's lightning despite terrestrial interferences is the necessary basis for further detailed study of their characteristics. Modern observational equipment provide high temporal and spectral resolution and allows to resolve the fine structure of lightning. Also it give us a hope to detect much weaker electrostatic discharges in the atmospheres of another planets of the Solar System.
... and IN Bubnov ... Zarka, P., J. Queinnec, BP Ryabov, VB Ryabov, VA Shevchenko, AV Arkhipov, ... more ... and IN Bubnov ... Zarka, P., J. Queinnec, BP Ryabov, VB Ryabov, VA Shevchenko, AV Arkhipov, HO Rucker, L. Denis, A. Gerbault, P. Dierich, and C. Rosolen, Ground-based high sensitivity radio astronomy at decameter wavelengths, in Planetary Radio Emissions IV, HO Rucker ...
Les courbes de brillance radio sont presentees pour une aire du disque galactique dans la region ... more Les courbes de brillance radio sont presentees pour une aire du disque galactique dans la region de l'anticentre en direction de PKS 0607+17, obtenues par observations radio dans les domaines decametriques et centimetriques. Les resultats des observations permettent de supposer que les sources non thermiques PKS 0607+17 et GR 0625+16 sont des restes de supernovae independants plutot que des parties de l'enveloppe du reste de supernova plus etendu Origem Loop
Purpose: A historical review of the experimental baselopment of low-frequency radio astronomy in ... more Purpose: A historical review of the experimental baselopment of low-frequency radio astronomy in Ukraine, its foundation half a century ago by an outstanding scientist S.Ya. Braude to the current state. Design/methodology/approach: The constant progress of electronic, computer and digital technologies, information and telecommunication technologies, theory and practice of antenna and receiving systems design, which introduction enriched the hardware and methodological ideology of construction and usage of the UTR-2, URAN, and GURT radio telescopes, have been used. Findings: The worldwide most effective national experimental radio astronomy means, the UTR-2, URAN, and GURT decameter-meter wave radiotelescopes, have been created and improved. The best combination of the systems main parameters: sensitivity; frequency band; spatial, frequency and temporal resolutions; noise immunity; uniformity of amplitude-frequency and space-frequency characteristics and multifunctionality has been p...
We present the results of separation of observed radio emission at decameter wavelengths into ext... more We present the results of separation of observed radio emission at decameter wavelengths into extragalactic background and halo components of the Galaxy. We have used a multifrequency UTR-2 (decametric wave radio telescope) survey to perform multifrequency temperature-versus-temperature (T-T) plots. The low-frequency radio maps of the area near the minimum of Galactic radiation (41∘<δ2000<46∘,7h45m<α2000<8h35m)$(41^{\circ } < \delta_{2000} < 46^{\circ }, 7^{\mathrm{h}} 45^{\mathrm{m}} < \alpha_{2000} < 8^{\mathrm{h}} 35^{\mathrm{m}}) $ has been investigated in detail. The differential spectral index of the Galaxy halo at the frequencies 14.7, 16.7, 20, and 25 MHz was determined in this direction using pairwise of all the above frequencies. Its value was found to be βG=2.81±0.03$\beta_{G} = 2.81 \pm 0.03 $. In addition, using the multifrequency T-T plots, the integral extragalactic brightness temperatures of isotropic background were determined to range 12 kK ...
Saturn Electrostatic discharges (SED) are sporadic broadband impulsive radio bursts associated wi... more Saturn Electrostatic discharges (SED) are sporadic broadband impulsive radio bursts associated with lightning in Saturnian atmosphere. After 25 years of space investigations in 2006 the first successful observations of SED on the UTR-2 radio telescope were carried out [1]. Since2007 along-term program of ED search and study in the Solar system has started. As a part of this program the unique observations with high time resolution were taken in 2010. New possibilities of UTR-2 radio telescope allowed to provide a long-period observations and study with high temporal resolution. This article presents the results of SED study in a wide range of time scales: from seconds to microseconds. For the first time there were obtained a low frequency spectrum of SED. We calculated flux densities of individual bursts at the maximum achievable time resolution. Flux densities of most intensive bursts reach 4200 Jy.
Purpose: The results of research in continuum decameter-wave radio emission of the Galaxy backgro... more Purpose: The results of research in continuum decameter-wave radio emission of the Galaxy background, ionized hydrogen regions, supernova remnants, extragalactic discrete sources, extended galaxies, galactic clusters, extragalactic background are given. The aim of this work is reviewing the results achieved for over 50-years of the UTR-2 radiotelescope research of our Galaxy and its population, as well as extragalactic radio sources in the continuum radio emission spectrum at extremely low frequencies for the ground based observations. Design/methodology/approach: The review, analysis, collection of archival data in various publications related to the subjectof this work. Findings: The basic results of studying the ionized hydrogen regions, supernova remnants, Galaxy background emission and its large-scale structure are given, and the maps of these sources are obtained. The catalog of extragalactic discrete radio sources of the most Northern sky part and the cosmological conclusions...
2015 International Conference on Antenna Theory and Techniques (ICATT), 2015
ABSTRACT The low frequency radio astronomy (decameter-meter range, frequencies of 10-300 MHz) cur... more ABSTRACT The low frequency radio astronomy (decameter-meter range, frequencies of 10-300 MHz) currently demonstrates rapid progress all over the world. New generations of large antennas-LOFAR, LWA, MWA and others – have been created in many countries. At the same time Ukrainian radio astronomical systems UTR-2 and URAN still remain the largest and most informative ones at the lowest frequency range available for the ground-based radio astronomy (below 33 MHz), especially after their radical modernization during the most recent years. A great number of top priority results have been obtained on the basis of these radio telescopes. The results prove a high significance of the low frequency radio astronomy for astrophysics. Substantial part of these results have been obtained in the course of many year cooperation between Ukraine on one side and France, Austria, Germany and other countries on the other. Creation of new low frequency instruments GURT (Ukraine) and LSS/NenuFAR (France) for the wide frequency range of 10-80 MHz opens up new possibilities for research and fruitful cooperation.
The positive possibilities of astrophysical objects studies(including the Solar system investigat... more The positive possibilities of astrophysical objects studies(including the Solar system investigations) using coordinated observations with the largest existing and coming low frequency radio telescopes are shown. The observations of the Sun, Jupiter, Saturn, ant others with UTR-2, URAN, NDA radio telescopes, and WIND, Cassini and STEREO space missions at frequencies lower than 40 MHz have been carried out.
ABSTRACT Successful ground-based detection of Saturn&#39;s lightning despite terrestrial inte... more ABSTRACT Successful ground-based detection of Saturn&#39;s lightning despite terrestrial interferences is the necessary basis for further detailed study of their characteristics. Modern observational equipment provide high temporal and spectral resolution and allows to resolve the fine structure of lightning. Also it give us a hope to detect much weaker electrostatic discharges in the atmospheres of another planets of the Solar System.
... and IN Bubnov ... Zarka, P., J. Queinnec, BP Ryabov, VB Ryabov, VA Shevchenko, AV Arkhipov, ... more ... and IN Bubnov ... Zarka, P., J. Queinnec, BP Ryabov, VB Ryabov, VA Shevchenko, AV Arkhipov, HO Rucker, L. Denis, A. Gerbault, P. Dierich, and C. Rosolen, Ground-based high sensitivity radio astronomy at decameter wavelengths, in Planetary Radio Emissions IV, HO Rucker ...
Les courbes de brillance radio sont presentees pour une aire du disque galactique dans la region ... more Les courbes de brillance radio sont presentees pour une aire du disque galactique dans la region de l'anticentre en direction de PKS 0607+17, obtenues par observations radio dans les domaines decametriques et centimetriques. Les resultats des observations permettent de supposer que les sources non thermiques PKS 0607+17 et GR 0625+16 sont des restes de supernovae independants plutot que des parties de l'enveloppe du reste de supernova plus etendu Origem Loop
Purpose: A historical review of the experimental baselopment of low-frequency radio astronomy in ... more Purpose: A historical review of the experimental baselopment of low-frequency radio astronomy in Ukraine, its foundation half a century ago by an outstanding scientist S.Ya. Braude to the current state. Design/methodology/approach: The constant progress of electronic, computer and digital technologies, information and telecommunication technologies, theory and practice of antenna and receiving systems design, which introduction enriched the hardware and methodological ideology of construction and usage of the UTR-2, URAN, and GURT radio telescopes, have been used. Findings: The worldwide most effective national experimental radio astronomy means, the UTR-2, URAN, and GURT decameter-meter wave radiotelescopes, have been created and improved. The best combination of the systems main parameters: sensitivity; frequency band; spatial, frequency and temporal resolutions; noise immunity; uniformity of amplitude-frequency and space-frequency characteristics and multifunctionality has been p...
We present the results of separation of observed radio emission at decameter wavelengths into ext... more We present the results of separation of observed radio emission at decameter wavelengths into extragalactic background and halo components of the Galaxy. We have used a multifrequency UTR-2 (decametric wave radio telescope) survey to perform multifrequency temperature-versus-temperature (T-T) plots. The low-frequency radio maps of the area near the minimum of Galactic radiation (41∘<δ2000<46∘,7h45m<α2000<8h35m)$(41^{\circ } < \delta_{2000} < 46^{\circ }, 7^{\mathrm{h}} 45^{\mathrm{m}} < \alpha_{2000} < 8^{\mathrm{h}} 35^{\mathrm{m}}) $ has been investigated in detail. The differential spectral index of the Galaxy halo at the frequencies 14.7, 16.7, 20, and 25 MHz was determined in this direction using pairwise of all the above frequencies. Its value was found to be βG=2.81±0.03$\beta_{G} = 2.81 \pm 0.03 $. In addition, using the multifrequency T-T plots, the integral extragalactic brightness temperatures of isotropic background were determined to range 12 kK ...
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