Radio Signature of Higher Atmospheric Meridional Flow and Implications for Magnetic Trees in the Sun
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
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2026
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| _version_ | 1866914527365300224 |
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| author | Routh, Srinjana Kumari, Anshu Bose, Rohan Pant, Vaibhav Paliwal, Divya Banerjee, Dipankar Gopalswamy, Nat |
| author_facet | Routh, Srinjana Kumari, Anshu Bose, Rohan Pant, Vaibhav Paliwal, Divya Banerjee, Dipankar Gopalswamy, Nat |
| contents | The coupling between plasma flows and magnetic fields in the solar atmosphere governs the transport of angular momentum and the redistribution of magnetic flux, yet its manifestation in the magnetically dominated upper chromosphere remains uncertain. Using 27 years of 17 GHz full-disk solar radio imaging observations from the Nobeyama Radioheliograph, we report the first detection of a poleward flow signature at heights of $3000\pm500$ km, an altitude where plasma magnetohydrodynamics expects magnetic dominance ($β<1$). The derived latitudinal velocity profile ($5-15$ m/s) mirrors the established photospheric meridional circulation, displaying modulation with solar cycle parameters. Comparison with long-term synoptic magnetograms reveals that the motion of 17 GHz brightness features closely tracks poleward magnetic flux transport, implying a deep magnetic anchoring of these structures. This finding provides the first observational evidence that chromospheric flows at radio wavelengths reflect subsurface meridional dynamics, consistent with the "magnetic tree" hypothesis, which links high-altitude motion to deep-seated magnetic connectivity. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_01947 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Radio Signature of Higher Atmospheric Meridional Flow and Implications for Magnetic Trees in the Sun Routh, Srinjana Kumari, Anshu Bose, Rohan Pant, Vaibhav Paliwal, Divya Banerjee, Dipankar Gopalswamy, Nat Solar and Stellar Astrophysics The coupling between plasma flows and magnetic fields in the solar atmosphere governs the transport of angular momentum and the redistribution of magnetic flux, yet its manifestation in the magnetically dominated upper chromosphere remains uncertain. Using 27 years of 17 GHz full-disk solar radio imaging observations from the Nobeyama Radioheliograph, we report the first detection of a poleward flow signature at heights of $3000\pm500$ km, an altitude where plasma magnetohydrodynamics expects magnetic dominance ($β<1$). The derived latitudinal velocity profile ($5-15$ m/s) mirrors the established photospheric meridional circulation, displaying modulation with solar cycle parameters. Comparison with long-term synoptic magnetograms reveals that the motion of 17 GHz brightness features closely tracks poleward magnetic flux transport, implying a deep magnetic anchoring of these structures. This finding provides the first observational evidence that chromospheric flows at radio wavelengths reflect subsurface meridional dynamics, consistent with the "magnetic tree" hypothesis, which links high-altitude motion to deep-seated magnetic connectivity. |
| title | Radio Signature of Higher Atmospheric Meridional Flow and Implications for Magnetic Trees in the Sun |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2605.01947 |