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Registration Number

0220U102400, 0118U100208 , R & D reports

Title

"Supersensitive and super-broadband investigations of some individual objects of the Universe in the low-frequency band" (code "Smuha")

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Head

Melnyk Valentyn , Доктор фізико-математичних наук

Registration Date

12-03-2020

Organization

Institute of Radio Astronomy of the NAS of Ukraine

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The work report contains 84 pp. of typewritten text in 4 chapters, 41 figures, 3 tables and the list of 4 references. The report presents the results of study of the thermal and sporadic radio emissions of the Sun during the minimum of solar activity (2018-2019). Under conditions of low solar activity the main attantion was focused on observations of the quiet Sun using radio telescopes UTR-2 and URAN-2. In order to estimate the size of "radio Sun" both instruments operated as short-baseline interferometers. The baselines of 225m (UTR-2) and 100m (URAN-2) were found to be the most optimal for accurate measurements of Sun size. .The first estimates of the sizes of the SUn were obtained at different frequencies. In improve the measurement accuracy a new method of RFI suppresion was developped on the base of correlation function analysis in the time domain. The fluxes of the solar thermal radio emissions in the frequency band 16-32 MHz were defined. The dependence of these fluxes versus frequency and their daily time profiles for several months were built . The statistical parameters of daily variations of the the quiet Sun fluxes were obtained. Observations of the sporadic solar radio emission were performed In the frames of the program for ground-based support of the PSP space mission during the 2-d and 3-d perihelion. Some faint type III bursts were recorded. The possibility of these bursts registration onboard of PSP spacecraft was estimated. The data archive of the solar radio emission observations by UTR-2 radio telescope during summer months of 2011-2016 was created to be then put online at the Institute's website. Joint online schedule of the observations with radio telescopes UTR-2 and GURT on the base of Google Spread Sheets was developped. The database of observations was created. The metadata format for the files with observation data by UTR-2 and GURT was developped for fast navigation and search of the required data.

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Dorovskyy Volodymyr V.
Zakharenko Viacheslav V.
Kalinichenko Mykola M.
Konovalenko Oleksandr O.
Ulyanov Oleg M.