On Using Gradient Dynamic Spectra (GraDS) to Study Type-II Solar Radio Bursts
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866908274140381184 |
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| author | Majee, Puja Kansabanik, Devojyoti Oberoi, Divya |
| author_facet | Majee, Puja Kansabanik, Devojyoti Oberoi, Divya |
| contents | 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 $\sim$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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_13876 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On Using Gradient Dynamic Spectra (GraDS) to Study Type-II Solar Radio Bursts Majee, Puja Kansabanik, Devojyoti Oberoi, Divya Solar and Stellar Astrophysics 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 $\sim$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. |
| title | On Using Gradient Dynamic Spectra (GraDS) to Study Type-II Solar Radio Bursts |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2503.13876 |