Origin of line broadening in fading granule: influence of small-scale turbulence
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arXiv
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| Hauptverfasser: | , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916462251212800 |
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| author | Ishikawa, Ryohtaroh T. Katsukawa, Yukio |
| author_facet | Ishikawa, Ryohtaroh T. Katsukawa, Yukio |
| contents | In the quiet region of the solar photosphere, turbulent convective motions of the granular flows naturally drive the subgranular-scale flows. However, evaluating such small-scale velocities is challenging because of the limited instrumental resolution. Our previous study, Ishikawa et al. (2020), found line broadening events during fading process of granules; however, their physical mechanism has remained unclear. In the present study, we observed the fading granules with the Hinode-SOT/SP and performed spectral line inversions. Moreover, we investigated broadening events of synthesized spectra in fading granules reproduced by the MURaM simulation. Our results demonstrated that the small-scale turbulent motions are excited in the fading process and such turbulent flows contribute to line broadening. The spectral line widths can be potential tracers of the photospheric turbulent flows. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_23654 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Origin of line broadening in fading granule: influence of small-scale turbulence Ishikawa, Ryohtaroh T. Katsukawa, Yukio Solar and Stellar Astrophysics In the quiet region of the solar photosphere, turbulent convective motions of the granular flows naturally drive the subgranular-scale flows. However, evaluating such small-scale velocities is challenging because of the limited instrumental resolution. Our previous study, Ishikawa et al. (2020), found line broadening events during fading process of granules; however, their physical mechanism has remained unclear. In the present study, we observed the fading granules with the Hinode-SOT/SP and performed spectral line inversions. Moreover, we investigated broadening events of synthesized spectra in fading granules reproduced by the MURaM simulation. Our results demonstrated that the small-scale turbulent motions are excited in the fading process and such turbulent flows contribute to line broadening. The spectral line widths can be potential tracers of the photospheric turbulent flows. |
| title | Origin of line broadening in fading granule: influence of small-scale turbulence |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2410.23654 |