Preparing for Heliopolarimetry using New-generation Ground-based Radio Telescopes
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| Format: | Preprint |
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2024
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| _version_ | 1866909245640802304 |
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| author | Kansabanik, Devojyoti Voulidas, Angelos |
| author_facet | Kansabanik, Devojyoti Voulidas, Angelos |
| contents | Coronal mass ejections (CMEs) are large-scale ejections of magnetized plasma from the Sun and are associated with the most extreme space weather events. The geoeffectiveness of a CME is primarily determined by the southward component of its magnetic fields (CME-$B_z$). Recent studies have shown that CMEs evolve significantly in the inner heliosphere ($\sim20-90\ R_\odot$), and relying on extrapolations from low coronal heights can lead to wrong predictions of CME-$B_z$ in the vicinity of Earth. Hence, it is important to measure CME magnetic fields at these heights to improve CME-$B_z$ prediction. A promising method to measure the CME-entrained magnetic field in the inner heliosphere is by measuring the changes in Faraday rotation (FR) of linearly polarized emission from background radio sources as their line-of-sight crosses the CME plasma. Here, we present the current preparation of new-generation ground-based radio telescopes for this purpose. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2407_05222 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Preparing for Heliopolarimetry using New-generation Ground-based Radio Telescopes Kansabanik, Devojyoti Voulidas, Angelos Solar and Stellar Astrophysics Instrumentation and Methods for Astrophysics Space Physics Coronal mass ejections (CMEs) are large-scale ejections of magnetized plasma from the Sun and are associated with the most extreme space weather events. The geoeffectiveness of a CME is primarily determined by the southward component of its magnetic fields (CME-$B_z$). Recent studies have shown that CMEs evolve significantly in the inner heliosphere ($\sim20-90\ R_\odot$), and relying on extrapolations from low coronal heights can lead to wrong predictions of CME-$B_z$ in the vicinity of Earth. Hence, it is important to measure CME magnetic fields at these heights to improve CME-$B_z$ prediction. A promising method to measure the CME-entrained magnetic field in the inner heliosphere is by measuring the changes in Faraday rotation (FR) of linearly polarized emission from background radio sources as their line-of-sight crosses the CME plasma. Here, we present the current preparation of new-generation ground-based radio telescopes for this purpose. |
| title | Preparing for Heliopolarimetry using New-generation Ground-based Radio Telescopes |
| topic | Solar and Stellar Astrophysics Instrumentation and Methods for Astrophysics Space Physics |
| url | https://arxiv.org/abs/2407.05222 |