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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2603.25421 |
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| _version_ | 1866908915670712320 |
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| author | Zhang, Peijin Morgan, John Oberoi, Divya Strauss, Du Toit Luo, Yingjie Kontar, Eduard Huang, Zesen Aggarwal, Keshav Kumari, Anshu Datta, Abhirup Morosan, Diana E. Botha, Gert J. J. |
| author_facet | Zhang, Peijin Morgan, John Oberoi, Divya Strauss, Du Toit Luo, Yingjie Kontar, Eduard Huang, Zesen Aggarwal, Keshav Kumari, Anshu Datta, Abhirup Morosan, Diana E. Botha, Gert J. J. |
| contents | Angular broadening observations of compact radio sources provide a powerful method for probing the solar corona and solar wind. Such observations enable studies of the phase structure function, turbulence amplitude, intermediate-scale density fluctuations, solar-wind heating rates, and dissipation scales. When a compact radio source is observed through coronal or solar-wind plasma, several observable effects can arise: (1) the apparent source size increases because of scattering by turbulent plasma, producing angular broadening; (2) the source flux density decreases because of scattering and absorption; (3) the observed angular broadening can be anisotropic, reflecting anisotropic turbulence in the corona and solar wind; and (4) the position angle of the anisotropy, measured from north through east, can help infer the orientation of the coronal magnetic field. These effects provide insights into the physical processes governing the solar wind and its interaction with electromagnetic waves, and they offer constraints on coronal turbulence and magnetic-field structure. At present, angular broadening studies remain limited and have mostly focused on very bright radio sources such as Tau A. The unprecedented sensitivity and angular resolution of the Square Kilometre Array are expected to greatly expand the number of suitable background sources, opening a new window on the solar corona, solar wind, and heliosphere. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_25421 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Probing the Solar Corona and the Solar Wind Using Angular Broadening Observations with the SKA Zhang, Peijin Morgan, John Oberoi, Divya Strauss, Du Toit Luo, Yingjie Kontar, Eduard Huang, Zesen Aggarwal, Keshav Kumari, Anshu Datta, Abhirup Morosan, Diana E. Botha, Gert J. J. Solar and Stellar Astrophysics Instrumentation and Methods for Astrophysics Angular broadening observations of compact radio sources provide a powerful method for probing the solar corona and solar wind. Such observations enable studies of the phase structure function, turbulence amplitude, intermediate-scale density fluctuations, solar-wind heating rates, and dissipation scales. When a compact radio source is observed through coronal or solar-wind plasma, several observable effects can arise: (1) the apparent source size increases because of scattering by turbulent plasma, producing angular broadening; (2) the source flux density decreases because of scattering and absorption; (3) the observed angular broadening can be anisotropic, reflecting anisotropic turbulence in the corona and solar wind; and (4) the position angle of the anisotropy, measured from north through east, can help infer the orientation of the coronal magnetic field. These effects provide insights into the physical processes governing the solar wind and its interaction with electromagnetic waves, and they offer constraints on coronal turbulence and magnetic-field structure. At present, angular broadening studies remain limited and have mostly focused on very bright radio sources such as Tau A. The unprecedented sensitivity and angular resolution of the Square Kilometre Array are expected to greatly expand the number of suitable background sources, opening a new window on the solar corona, solar wind, and heliosphere. |
| title | Probing the Solar Corona and the Solar Wind Using Angular Broadening Observations with the SKA |
| topic | Solar and Stellar Astrophysics Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2603.25421 |