Solar type-II radio bursts are coherent plasma emissions arising from magnetohydrodynamic shocks produced by either coronal mass ejections (CMEs) or flares. Type-II bursts sometimes show split-band emissions in the dynamic spectrum. When these split-band emissions come from regions just upstream and downstream of the shock, type-II band-splitting can be used as an important tool for estimating magnetic fields at the shock front. Earlier studies have shown that only ∼20\% of the type-IIs show morphologically similar split-bands. Imaging studies can unambiguously identify such instances, though they remain very rare. Here we suggest a useful approach to augment dynamic spectra-based studies by also examining the Gradient Dynamic Spectra (GraDS) of type-II emission. We also verified the conclusions of this approach against those from an imaging study.
@article{arxiv.2503.13876,
title = {On Using Gradient Dynamic Spectra (GraDS) to Study Type-II Solar Radio Bursts},
author = {Puja Majee and Devojyoti Kansabanik and Divya Oberoi},
journal= {arXiv preprint arXiv:2503.13876},
year = {2025}
}
Comments
6 pages, 3 figures; accepted for IAUS 388 Conference proceedings