Estimation of the lifetime of slow-decaying unipolar active regions in the framework of the turbulent erosion model
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arXiv
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| Natura: | Preprint |
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2024
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| _version_ | 1866913265738579968 |
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| author | Plotnikov, Andrei Abramenko, Valentina Kutsenko, Alexander |
| author_facet | Plotnikov, Andrei Abramenko, Valentina Kutsenko, Alexander |
| contents | We explore properties and behavior of slow-decaying unipolar sunspot groups in the framework of the turbulent erosion model suggested by Petrovay and Moreno-Insertis (1997). The basic concept of the model is the suppression of a turbulent diffusivity inside a magnetic flux tube by strong magnetic fields. As a result, the outer turbulent plasma detaches magnetic features primarily from the external border of a magnetic flux tube. The radius of the tube exhibits inward progression at a constant rate. The model predicts older sunspots to decay slower and it seems to be very promising to explain the slow decay of long-living unipolar sunspot groups. By analyzing the magnetic structure associated with a sunspot, we did reveal a gradual decrease of the magnetic structure radius at a constant rate implying the validity of the model. However, in some cases the derived velocity of the radius decrease was too low: our calculations provided implausibly high estimations for the lifetime and maximal area of such sunspots. We discuss possible additional mechanisms affecting the decay rate of such peculiar sunspots. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_04422 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Estimation of the lifetime of slow-decaying unipolar active regions in the framework of the turbulent erosion model Plotnikov, Andrei Abramenko, Valentina Kutsenko, Alexander Solar and Stellar Astrophysics We explore properties and behavior of slow-decaying unipolar sunspot groups in the framework of the turbulent erosion model suggested by Petrovay and Moreno-Insertis (1997). The basic concept of the model is the suppression of a turbulent diffusivity inside a magnetic flux tube by strong magnetic fields. As a result, the outer turbulent plasma detaches magnetic features primarily from the external border of a magnetic flux tube. The radius of the tube exhibits inward progression at a constant rate. The model predicts older sunspots to decay slower and it seems to be very promising to explain the slow decay of long-living unipolar sunspot groups. By analyzing the magnetic structure associated with a sunspot, we did reveal a gradual decrease of the magnetic structure radius at a constant rate implying the validity of the model. However, in some cases the derived velocity of the radius decrease was too low: our calculations provided implausibly high estimations for the lifetime and maximal area of such sunspots. We discuss possible additional mechanisms affecting the decay rate of such peculiar sunspots. |
| title | Estimation of the lifetime of slow-decaying unipolar active regions in the framework of the turbulent erosion model |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2403.04422 |