000005353 001__ 5353
000005353 005__ 20210528001923.0
000005353 0247_ $$2DOI$$a10.1051/0004-6361/202037733
000005353 037__ $$aSCART-2021-0094
000005353 100__ $$aZhang, PJ.
000005353 245__ $$aInterferometric imaging with LOFAR remote baselines of the fine structures of a solar type-IIIb radio burst
000005353 260__ $$c2020
000005353 520__ $$aContext. Solar radio bursts originate mainly from high energy electrons accelerated in solar eruptions like solar flares, jets, and coronal mass ejections. A sub-category of solar radio bursts with short time duration may be used as a proxy to understand wave generation and propagation within the corona. Aims: Complete case studies of the source size, position, and kinematics of short term bursts are very rare due to instrumental limitations. A comprehensive multi-frequency spectroscopic and imaging study was carried out of a clear example of a solar type IIIb-III pair. Methods: In this work, the source of the radio burst was imaged with the interferometric mode, using the remote baselines of the LOw Frequency ARray (LOFAR). A detailed analysis of the fine structures in the spectrum and of the radio source motion with imaging was conducted. Results: The study shows how the fundamental and harmonic components have a significantly different source motion. The apparent source of the fundamental emission at 26.56 MHz displaces away from the solar disk center at about four times the speed of light, while the apparent source of the harmonic emission at the same frequency shows a speed of < 0.02 c. The source size of the harmonic emission observed in this case is smaller than that in previous studies, indicating the importance of the use of remote baselines.
000005353 536__ $$aBRAIN.be project CCSOM/$$cBRAIN.be project CCSOM/$$fBRAIN.be project CCSOM
000005353 594__ $$aSTCE
000005353 6531_ $$aSun: radio radiation
000005353 6531_ $$aSun: activity
000005353 6531_ $$amethods: observational; 
000005353 6531_ $$aAstrophysics - Solar and Stellar Astrophysics
000005353 700__ $$aZucca, P.
000005353 700__ $$aSridhar, S. S. 
000005353 700__ $$aWang, C.B.
000005353 700__ $$aBisi, M. M.
000005353 700__ $$aDabrowski, B.
000005353 700__ $$aKrankowski, A.
000005353 700__ $$aMann, G. 
000005353 700__ $$aMagdalenic, J.
000005353 700__ $$aMorosan, D. E.
000005353 700__ $$aVocks, C.
000005353 773__ $$p Astronomy & Astrophysics$$v639$$y2020
000005353 8560_ $$fjasmina.magdalenic@observatoire.be
000005353 905__ $$apublished in
000005353 980__ $$aREFERD