naa a22 4500 510732577 CHVBK 20180411082958.0 cr unu---uuuuu 180411e20130501xx s 000 0 eng 10.1134/S1063772913040045 doi (NATIONALLICENCE)springer-10.1134/S1063772913040045 Flux-density variability of the blazar S5 1803+784 (J1800+7828) on a timescale of a month [Elektronische Daten] [A. Gorshkov, V. Konnikova, M. Mingaliev, A. Erkenov] The variability of the blazar S5 1803+784 (J1800+7828) on a timescale of a month is analyzed using daily RATAN-600 observations in 2009 (a total of 154 observations) at five frequences from 2.3 to 21.7 GHz. Cyclic variability of the flux density was detected at 7.7, 11.1, and 21.7 GHz on a timescale of 34-35 days, with modulation indices of 2.1, 3.6, and 6.6%, respectively. Characteristic time scales are derived from the light curves and the structure and autocorrelation functions. The spectrum of the variable component is rising, with spectral index α ≈ 1.3. The delays of the light-curve maxima between 21.7-11.1 and 11.1-7.7 GHz are three to four days. The integrated spectra for different light-curve phases indicate that the maximum shifts toward lower frequencies as the flux density passes through the maximum. Our results suggest that the variability can be explained mainly by non-stationary processes in the radio source itself, due to the propagation of shocks in the jet. Pleiades Publishing, Ltd., 2013 Gorshkov A. Moscow Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow, Russia aut Konnikova V. Moscow Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow, Russia aut Mingaliev M. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Karachaevo-Cherkessia Republic, Russia aut Erkenov A. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Karachaevo-Cherkessia Republic, Russia aut Astronomy Reports SP MAIK Nauka/Interperiodica 57/5(2013-05-01), 338-343 1063-7729 57:5<338 2013 57 11444 https://doi.org/10.1134/S1063772913040045 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1063772913040045 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Gorshkov A. Moscow Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow, Russia aut NATIONALLICENCE 700 1- Konnikova V. Moscow Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow, Russia aut NATIONALLICENCE 700 1- Mingaliev M. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Karachaevo-Cherkessia Republic, Russia aut NATIONALLICENCE 700 1- Erkenov A. Special Astrophysical Observatory, Russian Academy of Sciences, Nizhnii Arkhyz, Karachaevo-Cherkessia Republic, Russia aut NATIONALLICENCE 773 0- Astronomy Reports SP MAIK Nauka/Interperiodica 57/5(2013-05-01), 338-343 1063-7729 57:5<338 2013 57 11444 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer