Fine structures of a solar type III radio bursts observed with LOFAR
Abstract 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 $${}^2$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mrow/> <mml:mrow/> <mml:mn>2</mml:mn> </mml:mmultiscripts> </mml:math> , 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.
Authors
- Bartosz Dąbrowski (ORCID: https://orcid.org/0000-0002-4705-7798)
- D. E. Morosan (ORCID: https://orcid.org/0000-0002-8416-1375)
- R. A. Fallows (ORCID: https://orcid.org/0000-0002-5186-8040)
- Malte Bröse (ORCID: https://orcid.org/0000-0002-8386-6015)
- C. Vocks (ORCID: https://orcid.org/0000-0001-8583-8619)
- Barbara Matyjasiak (ORCID: https://orcid.org/0000-0003-2063-3545)
- P. T. Gallagher (ORCID: https://orcid.org/0000-0001-9745-0400)
- Hanna Rothkaehl (ORCID: https://orcid.org/0000-0002-2067-1982)
- Aleksandra Wołowska (ORCID: https://orcid.org/0000-0002-1406-8255)
- M. M. Bisi (ORCID: https://orcid.org/0000-0001-6821-9576)
- Paweł Flisek (ORCID: https://orcid.org/0000-0003-2922-5839)
- Adam Froń (ORCID: https://orcid.org/0000-0002-7982-0153)
- Peijin Zhang (ORCID: https://orcid.org/0000-0001-6855-5799)
- Jasmina Magdalenić (ORCID: https://orcid.org/0000-0003-1169-3722)
- Pietro Zucca
- Andrzej Krankowski (ORCID: https://orcid.org/0000-0003-2812-6222)
- G. Mann (ORCID: https://orcid.org/0000-0002-4452-3028)
- Christophe Marqué
Institutions
- New Jersey Institute of Technology (US)
- Centrum Badań Kosmicznych (PL)
- Rutherford Appleton Laboratory (GB)
- Dublin Institute For Advanced Studies (IE)
- University of Turku (FI)
- Science and Technology Facilities Council (GB)
- University Corporation for Atmospheric Research (US)
- Royal Observatory of Belgium (BE)
- Leibniz Institute for Astrophysics Potsdam (DE)
- Technische Universität Berlin (DE)
- University of Warmia and Mazury in Olsztyn (PL)
- Netherlands Institute for Radio Astronomy (NL)
- KU Leuven (BE)
- Polish Academy of Sciences (PL)
Publication Details
- Journal
- Acta Geophysica
- Published
- 2024-08-13
- DOI
- https://doi.org/10.1007/s11600-024-01421-4
- Citations
- 3
- Primary Topic
- Radio Astronomy Observations and Technology
- Type
- article
- Field-Weighted Citation Impact
- 0.99
Funders
- National Aeronautics and Space Administration
- Science Foundation Ireland
- Deutsche Forschungsgemeinschaft
- Bundesministerium für Bildung und Forschung
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek
- Max-Planck-Gesellschaft
- Narodowym Centrum Nauki
- Centre National de la Recherche Scientifique
- Université d'Orléans
- Ministerium für Innovation, Wissenschaft und Forschung des Landes Nordrhein-Westfalen
- Observatoire de Paris, Université de Recherche Paris Sciences et Lettres
- Science and Technology Facilities Council