Observation of O+ Characteristics During the Terrestrial Alfvén Wing State Induced by the April 2023 Coronal Mass Ejection

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dc.contributor.authorLiang, Haoming
dc.contributor.authorChen, Li-Jen
dc.contributor.authorFuselier, Stephen A.
dc.contributor.authorGomez, Roman G.
dc.contributor.authorBurkholder, Brandon
dc.contributor.authorBessho, Naoki
dc.contributor.authorGurram, Harsha
dc.contributor.authorRice, Rachel C.
dc.contributor.authorShuster, Jason
dc.contributor.authorArdakani, Akhtar S.
dc.date.accessioned2024-12-11T17:02:03Z
dc.date.available2024-12-11T17:02:03Z
dc.date.issued2024-10-28
dc.description.abstractWe 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.
dc.description.sponsorshipHL would like to express gratitude to Dr. Ying Zou for the valuable discussions. This study is supported by the NASA MMS Mission. HL acknowledges partial support from NASA grant 80NSSC24K0388. HL and HG acknowledge partial support of NSF grant AGS2247718. MMS data are publicly available at https://lasp.colorado.edu/mms/sdc/public/.
dc.description.urihttp://arxiv.org/abs/2410.21172
dc.format.extent15 pages
dc.genrejournal articles
dc.genrepreprints
dc.identifierdoi:10.13016/m2g5qb-xpo3
dc.identifier.urihttps://doi.org/10.48550/arXiv.2410.21172
dc.identifier.urihttp://hdl.handle.net/11603/37021
dc.language.isoen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Goddard Planetary Heliophysics Institute (GPHI)
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
dc.rightsPublic Domain
dc.rights.urihttps://creativecommons.org/publicdomain/mark/1.0/
dc.subjectAstrophysics - Solar and Stellar Astrophysics
dc.subjectPhysics - Space Physics
dc.titleObservation of O+ Characteristics During the Terrestrial Alfvén Wing State Induced by the April 2023 Coronal Mass Ejection
dc.typeText
dcterms.creatorhttps://orcid.org/0000-0001-8702-5806

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