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Publications
Publications (28)
Purpose: The overview of the scientifi c papers devoted to the study of the solar decameter radio emission with the world’s largest UTR-2 radio telescope (Ukraine) published for the last 50 years.
Design/methodology/approach: The study and analysis of the scientifi c papers on both sporadic and quiet (thermal) radiation of the Sun recorded with th...
Purpose: A historical review of the experimental base development of low-frequency radio astronomy in Ukraine, since 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 t...
At present a number of space missions (Parker, Juno, STEREO, SOHO, Wind and others) intensively investigates the Sun, solar wind and solar system planets. Among other, these spacecrafts are equipped with receivers of space radio emission. In case of space craft, there is a possibility to observe space radio emission at frequencies which are less th...
We discuss properties of a Type IV burst, which was observed on 2017 September 6, as a result of the powerful flare X 9.3. At decameter wavelengths this burst was observed by the radio telescopes STEREO A, URAN-2, and NDA at frequencies 5-35 MHz. This moving Type IV burst was associated with a coronal mass ejection (CME) propagating in the southwes...
We discuss properties of a Type IV burst, which was observed on 2017 September 6, as a result of the powerful flare X 9.3. At decameter wavelengths this burst was observed by the radio telescopes STEREO A, URAN-2, and NDA at frequencies 5 - 35 MHz. This moving Type IV burst was associated with a coronal mass ejection (CME) propagating in the southw...
Cutting edge astrophysical studies require more and more observing time at low-frequency radio telescopes, which is limited and quite expensive. Modern digital signal processing systems still unable to provide affordable computational and storage resources to allow simultaneous beamforming in a wide frequency range for multiple studies. Low-frequen...
Abstract
The decay of a Type III burst into two Type III bursts was registered during solar observations by GURT and URAN-2 radio telescopes on 2017 April 18. This was the first time such a phenomenon was observed. Newborn Type III bursts have drift rates smaller than that of a decaying Type III burst. Such decays of Type III bursts were predicted...
In the present paper an analysis of the polarization properties of the solar decameter spikes is performed. We found that decameter spikes can possess both left and right circular polarization which changes from 0 up to 100% with an average value 50%.
A decay of Type III burst into two Type III bursts was registered during solar observations by GURT and URAN-2 radio telescopes on April 18, 2017. Such phenomenon was observed for the first time. Newborn Type III bursts have drift rates smaller than that of decaying Type III burst. Such decays of Type III bursts were predicted by a gas-dynamic theo...
In the paper we present the preliminary results of analysis of the solar Type IIIb bursts properties. Namely the parameters of their fine structure known as striae are studied in the continuous frequency band 8-32 MHz. It is shown that durations and instantaneous frequency bandwidths depend on the observing frequency. Notably, bandwidth increases a...
We report on the results of observations of a type IV burst by URAN-2 (Ukrainian Radio interferometer of Academy Scienses) in the frequency range 22 - 33 MHz, which is associated with the CME (coronal mass ejection) initiated by a behind-the-limb active region (N05E151). This burst was observed also by the radio telescope NDA (Nancay Decameter Arra...
This paper describes digital radio astronomical receivers used for decameter and meter wavelength observations. This paper describes digital radio astronomical receivers used for decameter and meter wavelength observations. Since 1998, digital receivers performing on-the-fly dynamic spectrum calculations or waveform data recording without data loss...
Rapid progress currently takes place in the field of low-frequency radio astronomy of meterdecameter-hectometer range of wavelengths. It is caused by a radical modernization of the existing radio telescopes, creation of a new generation of instruments, space-borne observations, and by the development of research of all classes of astrophysical obje...
The current status of the large decameter radio telescope UTR-2 (Ukrainian T-shaped Radio telescope) together with its VLBI system called URAN is described in detail. By modernization of these instruments through implementation of novel versatile analog and digital devices as well as new observation techniques, the observational capabilities of UTR...
An event on 14 June 2012, observed with the radio telescopes UTR-2 (Kharkov, Ukraine), URAN-2 (Poltava, Ukraine), and NDA (Nançay, France) during a joint Summer campaign, is analyzed and discussed. The high solar activity resulted in a storm of spikes, and a storm of Type III bursts, Type IIIb bursts, and a Type IV burst observed in the decameter b...
The results of the first observations of solar sporadic radio emission within 10 – 70 MHz by the Giant Ukrainian Radio Telescope (GURT) are presented and discussed. Observations in such a wide range of frequencies considerably facilitate the registration of harmonic pairs. The solar U-burst harmonic pair observed on 8 August 2012 is analyzed. The b...
We analyze and discuss the properties of decameter spikes observed in July – August 2002 by the UTR-2 radio telescope. These bursts have a short duration (about one second) and occur in a narrow frequency bandwidth (50 – 70 kHz). They are chaotically located in the dynamic spectrum. Decameter spikes are weak bursts: their fluxes do not exceed 200 –...
The results of the first observations of solar sporadic radio emission within 10 − 70 MHz with the Giant Ukrainian Radio Telescope (GURT), now under construction, are presented. Observations in such a wide range of frequencies allowed considerable increase of the probability of harmonic pairs recording, where
a harmonic pair means the pair of burst...
Recently it was reported about observations of solar spikes at frequencies 20-30 MHz. Their average durations and frequency widths were about 1 s and 60 kHz correspondingly. In the present report the duration, frequency width and flux dependencies on frequency are considered for bursts observed during the spike storm on 27 July - 2 August 2002. It...
This paper deals with Type IIIb bursts, which were observed in the frequency band from 18 to 30 MHz. These bursts have fine frequency structures contrary to usual Type III bursts. The main properties of Type IIIb bursts such as number of striae in a burst, their frequency drift rates, durations, frequency widths of stria, emission fluxes are presen...
As known Type IIIb bursts is a chain of short, narrow-band bursts, which slowly drifts from high to low frequencies, in a manner similar to the normal Type III bursts. This report deals with analysis of Type IIIb bursts, which were observed in frequency band from 18 to 30 MHz on July - August 2002. The main parameters for some tens of Type IIIb bur...
High-frequency spikes have a narrow band (Delta f / f =1 - 2 %) and short duration (tau = 100 ms). Similar phenomenon in decameter range is called stria. Their properties are usually discussed when they are found in chains and form Type ?b bursts. In the present report results of observations of the stria bursts out of the chains, or spikes, chaoti...
