Observations of eigenfunctions of solar inertial modes using local correlation tracking of magnetic features
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866916601303924736 |
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| author | Joshi, Neelanchal Liang, Zhi-Chao Fournier, Damien Gizon, Laurent |
| author_facet | Joshi, Neelanchal Liang, Zhi-Chao Fournier, Damien Gizon, Laurent |
| contents | Solar inertial modes are quasi-toroidal modes of the Sun that are of practical interest as they allow probing the deep convection zone. Since 2010, solar images of the photospheric magnetic field are made available by HMI onboard the Solar Dynamics Observatory. In this work, we track the motion of the small magnetic features using a cross correlation technique. Under the assumption that these features are passive tracers, we obtain time series of the horizontal flow field on the solar surface. A Singular Value Decomposition is then applied to these data to extract the latitudinal profile as well as the time modulation of the modes of oscillation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_04333 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observations of eigenfunctions of solar inertial modes using local correlation tracking of magnetic features Joshi, Neelanchal Liang, Zhi-Chao Fournier, Damien Gizon, Laurent Solar and Stellar Astrophysics Solar inertial modes are quasi-toroidal modes of the Sun that are of practical interest as they allow probing the deep convection zone. Since 2010, solar images of the photospheric magnetic field are made available by HMI onboard the Solar Dynamics Observatory. In this work, we track the motion of the small magnetic features using a cross correlation technique. Under the assumption that these features are passive tracers, we obtain time series of the horizontal flow field on the solar surface. A Singular Value Decomposition is then applied to these data to extract the latitudinal profile as well as the time modulation of the modes of oscillation. |
| title | Observations of eigenfunctions of solar inertial modes using local correlation tracking of magnetic features |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2502.04333 |