Observation of O+ Characteristics During the Terrestrial Alfvén Wing State Induced by the April 2023 Coronal Mass Ejection
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arXiv
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| Autori principali: | , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866912090116063232 |
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| author | Liang, Haoming Chen, Li-Jen Fuselier, Stephen A. Gomez, Roman G. Burkholder, Brandon Bessho, Naoki Gurram, Harsha Rice, Rachel C. Shuster, Jason Ardakani, Akhtar S. |
| author_facet | Liang, Haoming Chen, Li-Jen Fuselier, Stephen A. Gomez, Roman G. Burkholder, Brandon Bessho, Naoki Gurram, Harsha Rice, Rachel C. Shuster, Jason Ardakani, Akhtar S. |
| contents | We report Magnetospheric Multiscale observations of oxygen ions (O+) during a coronal mass ejection in April 2023 when the solar wind was sub-Alfvénic and Alfvén wings formed. For the first time, O+ characteristics are studied at the contact region between the unshocked solar wind and the magnetosphere. The O+ ions show energies between 100s eV and ~30 keV. The possible sources are the ring current, the warm plasma cloak, and the ionosphere. The O+ ions exhibit bi-directional streaming along newly-formed closed field lines (CFLs), and dominantly anti-parallel on earlier-formed CFLs. Escaping O+ ions in the unshocked solar wind are observed. During the recovery phase, the O+ pitch-angle distribution associated with flux tubes shows dispersion, indicating potential loss to the solar wind. Our results show escaping as well as trapped O+ ions in the region where a magnetic cloud, an Alfvén wing, and magnetospheric field lines are mixed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_21172 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observation of O+ Characteristics During the Terrestrial Alfvén Wing State Induced by the April 2023 Coronal Mass Ejection Liang, Haoming Chen, Li-Jen Fuselier, Stephen A. Gomez, Roman G. Burkholder, Brandon Bessho, Naoki Gurram, Harsha Rice, Rachel C. Shuster, Jason Ardakani, Akhtar S. Space Physics Solar and Stellar Astrophysics We report Magnetospheric Multiscale observations of oxygen ions (O+) during a coronal mass ejection in April 2023 when the solar wind was sub-Alfvénic and Alfvén wings formed. For the first time, O+ characteristics are studied at the contact region between the unshocked solar wind and the magnetosphere. The O+ ions show energies between 100s eV and ~30 keV. The possible sources are the ring current, the warm plasma cloak, and the ionosphere. The O+ ions exhibit bi-directional streaming along newly-formed closed field lines (CFLs), and dominantly anti-parallel on earlier-formed CFLs. Escaping O+ ions in the unshocked solar wind are observed. During the recovery phase, the O+ pitch-angle distribution associated with flux tubes shows dispersion, indicating potential loss to the solar wind. Our results show escaping as well as trapped O+ ions in the region where a magnetic cloud, an Alfvén wing, and magnetospheric field lines are mixed. |
| title | Observation of O+ Characteristics During the Terrestrial Alfvén Wing State Induced by the April 2023 Coronal Mass Ejection |
| topic | Space Physics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2410.21172 |