naa a22 4500 510732194 CHVBK 20180411082957.0 cr unu---uuuuu 180411e20130701xx s 000 0 eng 10.1134/S1063772913070032 doi (NATIONALLICENCE)springer-10.1134/S1063772913070032 Determining source angular sizes from interplanetary-scintillation observations in the saturated regime [Elektronische Daten] [A. Glyantsev, S. Tyul'bashev, I. Chashei, V. Shishov] Interplanetary-scintillation observations of the radio source B0531+194 (J0534+1927) obtained over a wide range of elongations at 111 MHz using the Big Scanning Antenna of the Lebedev Physical Institute are presented. Near the Sun, the temporal spectra of the scintillations have a two-component form, corresponding to the superposition of refractive and diffractive scintillations that is characteristic of the saturated regime. A method for estimating the angular size of the scintillating component based on measurement of the break frequency in the diffractive part of the scintillation spectrum is presented. The scintillating component as a fraction of the total flux can be determined using the maximum scintillation index. The angular size of the scintillating component in B0531+194 is found to be 0.24″ ± 0.05″, and the ratio of the fluxes in the core and halo to be roughly one-third. The flux density in the compact radio component is 5 Jy. The estimated parameters of the angular structure of the source are compared with observations at other frequencies. Pleiades Publishing, Ltd., 2013 Glyantsev A. Pushchino State Natural Sciences Institute, Pushhino, Moscow region, Russia aut Tyul'bashev S. Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, Pushchino, Moscow region, Russia aut Chashei I. Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, Pushchino, Moscow region, Russia aut Shishov V. Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, Pushchino, Moscow region, Russia aut Astronomy Reports Springer US; http://www.springer-ny.com 57/7(2013-07-01), 509-516 1063-7729 57:7<509 2013 57 11444 https://doi.org/10.1134/S1063772913070032 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1134/S1063772913070032 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Glyantsev A. Pushchino State Natural Sciences Institute, Pushhino, Moscow region, Russia aut NATIONALLICENCE 700 1- Tyul'bashev S. Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, Pushchino, Moscow region, Russia aut NATIONALLICENCE 700 1- Chashei I. Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, Pushchino, Moscow region, Russia aut NATIONALLICENCE 700 1- Shishov V. Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Physical Institute, Russian Academy of Sciences, Pushchino, Moscow region, Russia aut NATIONALLICENCE 773 0- Astronomy Reports Springer US; http://www.springer-ny.com 57/7(2013-07-01), 509-516 1063-7729 57:7<509 2013 57 11444 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer