Magnetic flux in the Sun emerges unaffected by supergranular-scale surface flows
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866913249974288384 |
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| author | Mani, Prasad Hanson, Chris S. Dhanpal, Siddarth Hanasoge, Shravan Das, Srijan Bharati Rempel, Matthias |
| author_facet | Mani, Prasad Hanson, Chris S. Dhanpal, Siddarth Hanasoge, Shravan Das, Srijan Bharati Rempel, Matthias |
| contents | Magnetic flux emergence from the convection zone into the photosphere and beyond is a critical component of the behaviour of large-scale solar magnetism. Flux rarely emerges amid field-free areas at the surface, but when it does, the interaction between magnetism and plasma flows can be reliably explored. Prior ensemble studies identified weak flows forming near emergence locations, but the low signal-to-noise required averaging over the entire dataset, erasing information about variation across the sample. Here, we apply deep learning to achieve improved signal-to-noise, enabling a case-by-case study. We find that these associated flows are dissimilar across instances of emergence and also occur frequently in the quiet convective background. Our analysis suggests diminished influence of supergranular-scale convective flows and magnetic buoyancy on flux rise. Consistent with numerical evidence, we speculate that small-scale surface turbulence and / or deep-convective processes play an outsize role in driving flux emergence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_00295 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Magnetic flux in the Sun emerges unaffected by supergranular-scale surface flows Mani, Prasad Hanson, Chris S. Dhanpal, Siddarth Hanasoge, Shravan Das, Srijan Bharati Rempel, Matthias Solar and Stellar Astrophysics Magnetic flux emergence from the convection zone into the photosphere and beyond is a critical component of the behaviour of large-scale solar magnetism. Flux rarely emerges amid field-free areas at the surface, but when it does, the interaction between magnetism and plasma flows can be reliably explored. Prior ensemble studies identified weak flows forming near emergence locations, but the low signal-to-noise required averaging over the entire dataset, erasing information about variation across the sample. Here, we apply deep learning to achieve improved signal-to-noise, enabling a case-by-case study. We find that these associated flows are dissimilar across instances of emergence and also occur frequently in the quiet convective background. Our analysis suggests diminished influence of supergranular-scale convective flows and magnetic buoyancy on flux rise. Consistent with numerical evidence, we speculate that small-scale surface turbulence and / or deep-convective processes play an outsize role in driving flux emergence. |
| title | Magnetic flux in the Sun emerges unaffected by supergranular-scale surface flows |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2403.00295 |