A5033210674- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Ionosphere and magnetosphere dynamics
- Astronomical Observations and Instrumentation
- Advanced Research in Science and Engineering
- Solar and Space Plasma Dynamics
- Antenna Design and Optimization
- Radio Wave Propagation Studies
- Geophysics and Gravity Measurements
- Planetary Science and Exploration
- Lightning and Electromagnetic Phenomena
- Space exploration and regulation
- Geophysics and Sensor Technology
- Advanced Frequency and Time Standards
- Geomagnetism and Paleomagnetism Studies
- Magnetic confinement fusion research
- Atomic and Subatomic Physics Research
- Space Science and Extraterrestrial Life
- International Science and Diplomacy
- History and Developments in Astronomy
- Advanced Signal Processing Techniques
- Advanced Control and Stabilization in Aerospace Systems
National Academy of Sciences of Ukraine
2014-2024
Institute of Radio Astronomy
2015-2024
V. N. Karazin Kharkiv National University
2018-2024
Ventspils University of Applied Sciences
2022
Omsk State Technical University
2019
Netherlands Institute for Radio Astronomy
2004-2013
Moscow State University of Fine Chemical Technologies
1997-2000
Moscow Architectural Institute
2000
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...
The study of pulsars at the lowest radio frequencies observable from ground (10–30 MHz) is complicated by strong interstellar (dispersion, scattering) and ionospheric (scintillation, refraction) propagation effects, as well intense Galactic background noise interference. However, it permits us to measure plasma parameters (the effects which increase a power two >4 times wavelength), spectrum pulse profile low more accurately. Up now, only ∼10 have been successfully detected these...
NenuFAR is both a giant extension of the LOFAR and large standalone instrument in low-frequency range (10–85 MHz). It was designed Nançay with national international collaboration. Antenna radiators were modeled on LWA antenna design whereas preamplifiers France. Antennas will be distributed 96 mini-arrays 19 dual-polarized elements, densely covering disk 400 m diameter. A few are expected to lie at distances 2–3 km. silent control-command system designed, computer dialog defined. Receivers...
PSR B0950+08 is a bright non-recycled pulsar whose single-pulse fluence variability reportedly large. Based on observations at two widely separated frequencies, 55 MHz (NenuFAR) and 1.4 GHz (Westerbork Synthesis Radio Telescope), we review the properties of these single pulses. We conclude that they are more similar to ordinary pulses radio emission than special kind short Giant Pulses, observed from only handful pulsars. argue temporal variation interstellar medium along line sight this...
We present an analysis of several Jovian Io-related decametric radio storms recorded in 2004−2012 at the Ukrainian array UTR-2 using new generation baseband digital receivers. Continuous sampling within sessions lasting for hours enabled us to study evolution multiscale spectral patterns during whole storm varying time and frequency resolutions trace temporal transformation burst structures unprecedented detail. In addition well-known drifting millisecond known as S bursts we detected two...
NenuFAR (New extension in Nançay upgrading LOFAR), is a low-frequency SKA pathfinder presently construction and commissioning (France) [1], [2]. consists of 102 mini-arrays (MA) 19 dual polarization antennas each. 96 MA cover densely disk (core) 400m diameter, 6 are located at distances up to ~3 km. will the range 10-85 MHz, that encompasses LOFAR ([3] 0-80 MHz nominal, can be extended MHz), three instruments one: (i)the core, connected receivers French (FR606) station, form giant station...
Interstellar scattering (ISS) of radio pulsar emission can be used as a probe the ionised interstellar medium (IISM) and causes corruptions in timing experiments. Two types ISS phenomena (intensity scintillation pulse broadening) are caused by electron density fluctuations on small scales (< 0.01 AU). Theory predicts that these related, both have been widely employed to study properties IISM. Larger ($\sim$1-100\,AU) cause measurable changes dispersion correlated with observations estimate...
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...
Subject and Purpose. The writers aim at developing testing a new method of interference mitigation, proceeding from the example radio emissions Jupiter. Its effectiveness is compared with results other workers, equally relating to case significant overlapping, within time-frequency window under analysis, areas occupied by useful signal interference. Methods Methodology. analysis has revealed several fundamental limitations associated use standard statis- tical methods for identifying sources...
Decameter all-sky Survey has been running at UTR-2 radio telescope over the past few years, about 70% of observational data are processed. The is aimed searching for pulsars and transient sources. Present work shows results processing aforementioned part in order to find allowed detecting more than 500 signals. Distributions signals’ parameters (dispersion measures, galactic latitudes, “signal-to-noise-ratios” etc.) obtained, which give reason consider vast majority these pulses signals from cosmic
Lightning was detected by Voyager 2 at Uranus and Neptune, weaker electrical processes also occur throughout planetary atmospheres from galactic cosmic ray (GCR) ionisation. is an indicator of convection, whereas away storms modulate cloud formation chemistry, particularly if there little insolation to drive other mechanisms. The ice giants appear be unique in the Solar System that they are distant enough Sun for GCR-related mechanisms significant clouds climate, yet convective lightning...
The Saturn Electrostatic Discharges (SED) simultaneously recorded in the initial period of storm F at UTR-2 radio telescope and Cassini spacecraft are investigated. used FFT-spectral receiver operating 12−33 MHz, while serial spectrum analyzer RPWS (Radio Plasma Wave Science) 1.8−16 MHz. ground-based space-borne data processed have shown very good agreement. E-folding time SED its dependence on episode intensity were determined, too.
УДК 520.272.2:621.396.677.494 PACS number: 95.55.-Jz Предмет и цель работы: Исследуются технические возможности антенной системы МАRК-4В для ее дальнейшего использования в качестве 32 метрового радиотелескопа (РТ-32) последующего проведения одновременных спектральных радиоастрономических наблюдений C K диапазонах. Методы методология: В исследованиях используются результаты наших собственных измерений, проведенных на системе МАRK-4В, экспертные оценки, открытые источники информации,...
The decameter pulsar/transient survey is now being made using the UTR-2 radio telescope.The strategy and parameters, equipment characteristics, data processing algorithms as well preliminary results are described.The very first result was discovery of emission pulsar J0240+62.Test measurements have shown sensitivity, reached in present survey, 5 Jy for transient signals, several mJy -for periodic emission.
The results are reported of the very first study Saturn lightning fine time structure with superfine resolution (within hundreds to units nanoseconds). It is ascertained that has two intrinsic scales: from hundreds/tens microseconds. analysis was made dispersion measure on signals’ path storm in atmosphere ground-based telescope. Key words: high discrimination, lightnings Saturn, thin temporal pattern, dispersive delay , ionosphere, interplanetary medium Manuscript submitted 09.12.2013 Radio...