Interferometric imaging with LOFAR remote baselines of the fine structures of a solar type-IIIb radio burst

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http://hdl.handle.net/10138/320873

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Zhang , P , Zucca , P , Sridhar , S S , Wang , C , Bisi , M M , Dabrowski , B , Krankowski , A , Mann , G , Magdalenic , J , Morosan , D E & Vocks , C 2020 , ' Interferometric imaging with LOFAR remote baselines of the fine structures of a solar type-IIIb radio burst ' , Astronomy & Astrophysics , vol. 639 , A115 . https://doi.org/10.1051/0004-6361/202037733

Title: Interferometric imaging with LOFAR remote baselines of the fine structures of a solar type-IIIb radio burst
Author: Zhang, PeiJin; Zucca, Pietro; Sridhar, Sarrvesh Seethapuram; Wang, ChuanBing; Bisi, Mario M.; Dabrowski, Bartosz; Krankowski, Andrzej; Mann, Gottfried; Magdalenic, Jasmina; Morosan, Diana E.; Vocks, Christian
Contributor: University of Helsinki, Space Physics Research Group
Date: 2020-07-20
Language: eng
Number of pages: 5
Belongs to series: Astronomy & Astrophysics
ISSN: 0004-6361
URI: http://hdl.handle.net/10138/320873
Abstract: Context. Solar radio bursts originate mainly from high energy electrons accelerated in solar eruptions like solar flares, jets, and coronal mass ejections. A sub-category of solar radio bursts with short time duration may be used as a proxy to understand wave generation and propagation within the corona.Aims. Complete case studies of the source size, position, and kinematics of short term bursts are very rare due to instrumental limitations. A comprehensive multi-frequency spectroscopic and imaging study was carried out of a clear example of a solar type IIIb-III pair.Methods. In this work, the source of the radio burst was imaged with the interferometric mode, using the remote baselines of the LOw Frequency ARray (LOFAR). A detailed analysis of the fine structures in the spectrum and of the radio source motion with imaging was conducted.Results. The study shows how the fundamental and harmonic components have a significantly different source motion. The apparent source of the fundamental emission at 26.56 MHz displaces away from the solar disk center at about four times the speed of light, while the apparent source of the harmonic emission at the same frequency shows a speed of <0.02 c. The source size of the harmonic emission observed in this case is smaller than that in previous studies, indicating the importance of the use of remote baselines.
Subject: Sun: radio radiation
Sun: activity
methods: observational
EMISSION
POSITION
CORONA
115 Astronomy, Space science
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