A5067328006- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Antenna Design and Optimization
- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Radio Wave Propagation Studies
- Space exploration and regulation
- Gamma-ray bursts and supernovae
- Superconducting and THz Device Technology
- Earthquake Detection and Analysis
- Planetary Science and Exploration
- Space Science and Extraterrestrial Life
- Geomagnetism and Paleomagnetism Studies
- Solar Radiation and Photovoltaics
- Astronomical Observations and Instrumentation
- Microwave Engineering and Waveguides
- GNSS positioning and interference
- History and Developments in Astronomy
- Stellar, planetary, and galactic studies
- Advanced Research in Science and Engineering
- Atmospheric Ozone and Climate
- Computational Physics and Python Applications
- Spacecraft Design and Technology
- Antenna Design and Analysis
- Advanced Control and Stabilization in Aerospace Systems
Institute of Radio Astronomy
2015-2024
National Academy of Sciences of Ukraine
2015-2024
V. N. Karazin Kharkiv National University
2021
Institute of Applied Astronomy
2017
Space Research and Technology Institute
2017
Bulgarian Academy of Sciences
2017
Austrian Academy of Sciences
2011
Space Research Institute
2011
Centre National de la Recherche Scientifique
2011
Observatoire de Paris
2011
This paper describes digital radio astronomical receivers used for decameter and meter wavelength observations. Since 1998, performing on-the-fly dynamic spectrum calculations or waveform data recording without loss have been at the UTR-2 telescope, URAN VLBI system, GURT new generation telescope. Here, we detail these developed operation in strong interference environment that prevails range. Data collected with allowed us to discover numerous objects phenomena low frequencies, a summary of...
PACS numbers: 95.55.Jz, 95.30.-k, 95.55.-n Purpose: define and theoretically substantiate the range of astrophysical problems that may be efficiently solved using small antenna arrays. Design/methodology/approach: Observation parameters configurations a set arrays included in future Giant Ukrainian radio telescope, have been derived based on theoretical analysis scientific results obtained by UTR-2 URAN telescopes. Results: We proved wide scope can low-frequency arrays, ranging from Solar...
We analyze the possibilities of detecting a signal in hydrogen 21 cm line, which was formed early Universe during Dark Ages cosmological epoch, using Ukrainian radio telescopes UTR-2 and GURT National Academy Sciences Ukraine.As result expansion, this line is shifted to decameter range wavelengths (λ obs ≈ 18 m, ν 16 MHz) band operational frequencies these telescopes.The brightness temperature predicted sky-averaged global ranges from ∼ -0.08 0.02 K, depending on model.Such faint challenge...
We report about observations of the solar U+III bursts on 5 June 2020 by means a new active antenna designed to receive radiation in 4-70 MHz. This instrument can serve as prototype ultra-long-wavelength radiotelescope for farside Moon. Our analysis experimental data is based simultaneous records obtained with arrays GURT and NDA high frequency time resolution, e-Callisto network well using space-based observatories STEREO WIND. The results from this observational study confirm model Reid...
Context. Cassiopeia A is one of the most extensively studied supernova remnants (SNRs) in our Galaxy. The analysis its continuum spectrum through low-frequency observations plays an important role for understanding evolution radio source and propagation synchrotron emission to observers SNR environment ionized interstellar medium. Aims. In this paper we present measurements integrated Cas characterize properties free–free absorption toward SNR. We also add new track slowly evolving...
We present the 25-element active antenna array and its remote control in framework of GURT project, Ukrainian Radio Telescope a new age. To implement beamforming, is phased with help discrete cable delay lines analog manner. The carried out through paired encoder decoder that can transmit parallel data about codes serially. microcontroller provides online interaction between personal computer beamformers encoder-decoder system wires or wireless. pattern has been measured by radio astronomy methods.
The interpretation of solar radio bursts observed by Parker Solar Probe (PSP) in the encounter phase plays a key role understanding intrinsic properties emission mechanism corona. Lower time-frequency resolution PSP receiver can be overcome simultaneous ground-based observations using more advanced antennas and receivers. In this paper we present such for which active region 12765, begetter type III, J, U bursts, was within sight instruments behind limb spacecraft. We used subarray Giant...
PACS number: 84.40.Ba Purpose: theoretical and experimental investigations of sensitivity by the signal-to-noise ratio criterion active antenna used as a phased array element GURT radio telescope new generation. Design/methodology/approach: A mathematical model is proposed, technique its application for calculation being described. Findings: Numerical studies temperatures external internal noises at output are carried out, well estimated over wide frequency range from 10 to 80 MHz....
The new Giant Ukrainian Radio Telescope (GURT) intended for operation in 8-80 MHz range is now under construction. It employs an active phased array antenna composed of many dipole subarrays, several which have been implemented and are used radio astronomy observations. In this two-part paper, the electrical noise parameters subarray studied by numerical experimental ways. part, a theoretical model based on wave theory noisy multiport networks that takes into account mutual coupling placed...
Purpose: A historical review of the experimental baselopment low-frequency radio astronomy in Ukraine, its foundation half a century ago by an outstanding scientist S.Ya. Braude to current state. Design/methodology/approach: The constant progress electronic, computer and digital technologies, information telecommunication theory practice antenna receiving systems design, which introduction enriched hardware methodological ideology construction usage UTR-2, URAN, GURT telescopes, have been...
Purpose: Theoretical and experimental studies of the active antenna – an element low-frequency radio telescope array for future observatory on farside Moon. Design/methodology/approach: To study antenna, consisting a complex-shaped dipole low-noise amplifier, we used its mathematical model in form two-port network, whose electrical parameters are set by scattering matrix, noise being covariance matrix spectral densities waves. This allows ma[1]king correct analysis signal-to-noise ratio at...
The results of radio emission observations for Cassiopeia A source at frequencies 35, 38, 40, 45, 50, 55, 60 and 65 MHz are presented. At these frequencies, the radio-emission flux density ratio between Cygnus epoch 2014 is obtained. Brief information about antenna facility reception equipment used in measurements given. 35−65 MHz, found by comparison with well-known A. intersection frequency low-frequency spectra experimentally determined. obtained other authors secular decrease 38...
This second part of two articles' sequence presents the detailed numerical analysis electrical and noise parameters a subarray Giant Ukrainian Radio Telescope (GURT) designed for operation in frequency range 8-80 MHz. The theoretical model calculation technique its developed first is used. Frequency behaviors absorption area, radiation efficiency, system temperature budget are studied. Special attention paid to sensitivity given terms sky dominance (SND) system-equivalent flux density...
The integrated radioastronomy research has shown a large potential of the URAN system decameter radiotelescopes for space weather investigations. This allows obtaining some important information about all links chain Sun - interplanetary medium Earth's ionosphere. In particular, new results are obtained solar sporadic radio emission, wind flow structure behind orbit, and correlation between ionospheric scintillation index electron flux density in near-earth space.
Rapid progress currently takes place in the field of low-frequency radio astronomy meterâdecameterâhectometer range wavelengths. It is caused by a radical modernization existing telescopes, creation new generation instruments, space-borne observations, and development research on all classes astrophysical objects, including Solar System. On other hand, difficulties specific to known, which are technical, methodological, physical limitations. An effective strategy for overcoming these...
We analyze the possibilities of detecting a signal in hydrogen 21 cm line, which was formed early universe during Dark Ages, using Ukrainian radio telescopes UTR-2 and GURT National Academy Sciences Ukraine. As result cosmological expansion, this line is shifted to decameter range wavelengths ($\lambda_{obs}\approx18$ m, $\nu_{obs}\approx16$ MHz) band operating frequencies these telescopes. The brightness temperature predicted sky-averaged global ranges from $\sim-0.08$ $\sim0.02$ K,...