Bartosz Dabrowski, Aleksandra Wolowska, Christian Vocks, Jasmina Magdalenić, Peijin Zhang, Pawel Flisek, Malte Bröse, Diana E. Morosan, Andrzej Krankowski, Adam Fron, Gottfried Mann, Pietro Zucca, Mario Bisi, Richard Fallows, Peter Gallagher, Christophe Marqué, Barbara Matyjasiak, Hanna Rothkaehl
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Fine structures of a solar type III radio bursts observed with LOFAR
We present spectral and imaging LOFAR (LOw-Frequency ARray) observations in the 20 – 40 MHz range of solar radio bursts fine structures, such as flag-like, sail-like, and dot-like that appeared on 8 April 2019. These structures were associated with type III solar radio bursts that occurred in the 40 – 80 MHz band. The mean duration and spectral widths of the fine structures range from 1.0 to 3.4 s and from 0.3 to 0.9 MHz, respectively. Additionally, we investigated the radio images of eight fine structures – two flags, two sails and four dots. This allowed us to determine their emission source sizes, which ranged from 240 to 392 arcmin\({}^2\), and their frequencies from 25.58 to 39.25 MHz as well as their location. They occurred on the east side of the Sun and were most likely associated with an emerging active region NOAA AR 12738, where a weak B1.7 flare was observed.
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Acta Geophysica is open to all kinds of manuscripts including research and review articles, short communications, comments to published papers, letters to the Editor as well as book reviews. Some of the issues are fully devoted to particular topics; we do encourage proposals for such topical issues. We accept submissions from scientists world-wide, offering high scientific and editorial standard and comprehensive treatment of the discussed topics.
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