Version 1
: Received: 26 August 2023 / Approved: 28 August 2023 / Online: 29 August 2023 (10:09:41 CEST)
Version 2
: Received: 15 September 2023 / Approved: 18 September 2023 / Online: 19 September 2023 (03:38:47 CEST)
Alissandrakis, C.; Hillaris, A.; Bouratzis, C.; Armatas, S. Fine Structure of Solar Metric Radio Bursts: ARTEMIS-IV/JLS and NRH Observations. Universe2023, 9, 442.
Alissandrakis, C.; Hillaris, A.; Bouratzis, C.; Armatas, S. Fine Structure of Solar Metric Radio Bursts: ARTEMIS-IV/JLS and NRH Observations. Universe 2023, 9, 442.
Alissandrakis, C.; Hillaris, A.; Bouratzis, C.; Armatas, S. Fine Structure of Solar Metric Radio Bursts: ARTEMIS-IV/JLS and NRH Observations. Universe2023, 9, 442.
Alissandrakis, C.; Hillaris, A.; Bouratzis, C.; Armatas, S. Fine Structure of Solar Metric Radio Bursts: ARTEMIS-IV/JLS and NRH Observations. Universe 2023, 9, 442.
Abstract
Radio bursts provide important diagnostics of energetic phenomena of the Sun. In particular, bursts in decimetric and metric wavelengths probe the physical conditions and the energy release processes in the low corona as well as their association with heliospheric phenomena. The advent of spectral radio data with high time and high frequency resolution has provided a wealth of information on phenomena of short duration and narrow bandwidth. Of particular value are spectral data combined with imaging observations at specific frequencies. In this work we briefly review the results of a series of observations comprised from high-sensitivity, low-noise dynamic spectra obtained with the acousto-optic analyzer (SAO) of the ARTEMIS-IV/JLS solar radiospectrograph, in conjunction with high time-resolution images from the Nançay Radioheliograph (NRH). Our studies include fine structures embedded in type IV burst continua (mostly narrow-band "spikes" and intermediate drift "fiber" bursts) and spike-like structures detected near the front of type-II bursts. The implications of the observational results to theoretical models are discussed.
Keywords
Sun: corona; Sun: radio radiation; acceleration of particles; magnetic reconnection; Sun: Radiation mechanisms: non-thermal; Sun: Meter-Wavelengths and Longer; Sun: activity; Sun: Flares; Sun: Ejections; Sun: magnetic fields
Subject
Physical Sciences, Astronomy and Astrophysics
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Commenter: Alexander Hillaris
Commenter's Conflict of Interests: Author