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Features of Secular Changes in the Flux Density of the Cas a Supernova Remnant, from Centimeter to Decameter Wavelengths

1
Department of Theoretical Physics and Astronomy, Odessa I.I. Mechnikov National University, Pastera Str. 42, 65023 Odessa, Ukraine
2
Ventspils International Radio Astronomy Centre (VIRAC), Inzenieru Str. 101, LV-3601 Ventspils, Latvia
3
Odessa Observatory “URAN-4” of the Institute of Radio Astronomy NAS of Ukraine, Marazlievskaya Str. 1V, 65014 Odessa, Ukraine
*
Authors to whom correspondence should be addressed.
Academic Editor: Quentin A. Parker
Galaxies 2021, 9(2), 30; https://doi.org/10.3390/galaxies9020030
Received: 20 March 2021 / Revised: 19 April 2021 / Accepted: 30 April 2021 / Published: 4 May 2021
The purpose of this work is to summarize a large amount of observational data about the secular decrease of Cas A flux in the radio range, as an indicator of physical processes both in the source itself and as a consequence of the influence of the propagation medium. This paper presents results of observations Cas A and Cyg A on radio telescopes of International Radio Astronomy Center (Latvia), and URAN-4 phased array antenna (Institute of Radio Astronomy NAS of Ukraine). According to URAN-4 observations, there were seasonal–diurnal changes in Cas A/Cyg A flux ratios due to the effects of solar activity on the ionosphere, and there may be no secular decrease in Cas A flux density, or a weak tendency to decrease it. The significant influence of the ionosphere makes it difficult to use Cyg A as a reference source in the decameter radio range. In the centimeter radio range, there were episodic intra-day variations at the level 8–10% of Cas A averaged flux. Additionally, in the period January–February 2021, Cas A flux was about 1.7 times that of Cyg A. Taking into account the observed complex type of secular decrease in Cas A flux against the background of changes in space weather variations, further observations of Cas A were planned at radio observatories in Latvia and Ukraine. View Full-Text
Keywords: secular radio flux decrease; Cassiopeia A; supernova remnant secular radio flux decrease; Cassiopeia A; supernova remnant
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MDPI and ACS Style

Gorbynov, A.; Sukharev, A.; Ryabov, M.; Bezrukovs, V.; Orbidans, A. Features of Secular Changes in the Flux Density of the Cas a Supernova Remnant, from Centimeter to Decameter Wavelengths. Galaxies 2021, 9, 30. https://doi.org/10.3390/galaxies9020030

AMA Style

Gorbynov A, Sukharev A, Ryabov M, Bezrukovs V, Orbidans A. Features of Secular Changes in the Flux Density of the Cas a Supernova Remnant, from Centimeter to Decameter Wavelengths. Galaxies. 2021; 9(2):30. https://doi.org/10.3390/galaxies9020030

Chicago/Turabian Style

Gorbynov, Artem; Sukharev, Artem; Ryabov, Michail; Bezrukovs, Vladislavs; Orbidans, Arturs. 2021. "Features of Secular Changes in the Flux Density of the Cas a Supernova Remnant, from Centimeter to Decameter Wavelengths" Galaxies 9, no. 2: 30. https://doi.org/10.3390/galaxies9020030

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