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
- Publication:
-
Acta Geophysica
- Pub Date:
- February 2025
- DOI:
- Bibcode:
- 2025AcGeo..73..987D
- Keywords:
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- Sun;
- Radio;
- Bursts;
- Fine structures;
- Corona;
- LOFAR