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Peer-reviewedCC BY 4.0The Astrophysical Journal Supplement Series

Catalog of Solar Radio Bursts Detected by the LOFAR LV614 Station at the Irbene Observatory during Solar Cycle 25

  • Jānis Šteinbergs1,2
  • Dmitrii Kolotkov2,3
  • Valery M. Nakariakov2,3,4
  • Vladislavs Bezrukovs2
  • Pietro Zucca5
  • Jānis Kaminskis1
5 affiliations
  1. 1Riga Technical University
  2. 2Ventspils University of Applied Sciences
  3. 3University of Warwick
  4. 4Universidad Bernardo O’Higgins
  5. 5ASTRON—Netherlands Institute for Radio Astronomy
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Abstract

A catalog (doi: 10.5281/zenodo.20157853 ) of solar radio bursts detected with the LV614 LOFAR station at the Irbene Observatory, Latvia, in the stand-alone mode from 2022 June to 2025 August in the 29–60 MHz frequency range is presented. Observations were conducted with a weekly cadence, 1 s time resolution, and 0.195 MHz spectral resolution. The cumulative duration of the observation was 1125.2 hr. For all analyzed observations, bandpass calibration was applied using Cassiopeia A as a reference source. In total, the catalog includes 335 solar radio bursts. Radio bursts of all five main types, I–V, were detected. Specifically, the catalog contains parameters of 23, 8, 293, 6, and 5 bursts of Type I, II, III, IV, and V, respectively. The detected burst peak flux ranges from 0.3 to 234 SFU. The catalog provides information about the peak flux and frequency, and the estimated height of the source above the solar surface. For Type II and III bursts, we also give the estimations of the frequency drifts, with mean values 0.043 and 4.383 MHz s ⁻¹ , respectively. We also estimated the fit df / dt = Af a , with the best-fit parameters A = 0.78 and a = 0.43. The numbers of Type I and III events are found to decrease with the peak flux, with the power-law indices about −0.9 and −1.25, respectively. For Type III, we estimated electron-beam speed ranging from 0.005 to 0.477 of the speed of light for the fundamental frequency, and 0.008–0.794 of the speed of light for its second harmonic.

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Cite

BibTeXRIS
BibTeX
@article{steinbergs2026catalog,
  title = {{Catalog of Solar Radio Bursts Detected by the LOFAR LV614 Station at the Irbene Observatory during Solar Cycle 25}},
  author = {Jānis Šteinbergs and Dmitrii Kolotkov and Valery M. Nakariakov and Vladislavs Bezrukovs and Pietro Zucca and Jānis Kaminskis},
  journal = {The Astrophysical Journal Supplement Series},
  year = {2026},
  month = nov,
  doi = {10.3847/1538-4365/aeac28},
  url = {https://iopscience.iop.org/article/10.3847/1538-4365/aeac28},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Catalog of Solar Radio Bursts Detected by the LOFAR LV614 Station at the Irbene Observatory during Solar Cycle 25
AU  - Jānis Šteinbergs
AU  - Dmitrii Kolotkov
AU  - Valery M. Nakariakov
AU  - Vladislavs Bezrukovs
AU  - Pietro Zucca
AU  - Jānis Kaminskis
PY  - 2026
DA  - 2026/11/03
JO  - The Astrophysical Journal Supplement Series
DO  - 10.3847/1538-4365/aeac28
UR  - https://iopscience.iop.org/article/10.3847/1538-4365/aeac28
AB  - A catalog (doi: 10.5281/zenodo.20157853 ) of solar radio bursts detected with the LV614 LOFAR station at the Irbene Observatory, Latvia, in the stand-alone mode from 2022 June to 2025 August in the 29–60 MHz frequency range is presented. Observations were conducted with a weekly cadence, 1 s time resolution, and 0.195 MHz spectral resolution. The cumulative duration of the observation was 1125.2 hr. For all analyzed observations, bandpass calibration was applied using Cassiopeia A as a reference source. In total, the catalog includes 335 solar radio bursts. Radio bursts of all five main types, I–V, were detected. Specifically, the catalog contains parameters of 23, 8, 293, 6, and 5 bursts of Type I, II, III, IV, and V, respectively. The detected burst peak flux ranges from 0.3 to 234 SFU. The catalog provides information about the peak flux and frequency, and the estimated height of the source above the solar surface. For Type II and III bursts, we also give the estimations of the frequency drifts, with mean values 0.043 and 4.383 MHz s ⁻¹ , respectively. We also estimated the fit df / dt = Af a , with the best-fit parameters A = 0.78 and a = 0.43. The numbers of Type I and III events are found to decrease with the peak flux, with the power-law indices about −0.9 and −1.25, respectively. For Type III, we estimated electron-beam speed ranging from 0.005 to 0.477 of the speed of light for the fundamental frequency, and 0.008–0.794 of the speed of light for its second harmonic.
SN  - 0067-0049
SN  - 1538-4365
ER  -