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dc.contributor.authorFoster, John C
dc.contributor.authorErickson, Philip J
dc.date.accessioned2021-08-10T21:58:53Z
dc.date.available2021-08-10T21:58:53Z
dc.date.issued2021-07
dc.date.submitted2021-05
dc.identifier.issn2296-987X
dc.identifier.urihttps://hdl.handle.net/1721.1/131170
dc.description.abstractThe geospace plume couples the ionosphere, plasmasphere, and magnetosphere from sub-auroral regions to the magnetopause, on polar field lines, and into the magnetotail. We describe Van Allen Probes observations of ionospheric O+ ions at altitudes of 3–6 R[subscript E] in the near vicinity of the geospace plume in the noon and post-noon sector. The temporal variation of warm ion fluxes observed as a function of time on a moving spacecraft is complicated by changing spacecraft position and complex ion drift paths and velocities that are highly sensitive to ion energy, pitch angle and L value. In the “notch” region of lower density plasma outside the morning-side plasmapause, bi-directionally field aligned fluxes of lower energy (&amp;lt;5 keV) ions, following corotation-dominated drift trajectories from the midnight sector, are excluded from geospace plume field lines as they are deflected sunward in the plume flow channel. In general, O+ at ring current energies (∼10 keV) is bi-directionally field aligned on plume field lines, while lower energy O⁺(<3 keV) are absent. The observation of ion plumes with energies increasing from ∼1 keV– > 20 keV in the dusk sector outer plasmasphere is interpreted as evidence for localized ionospheric O+ outflow at the outer edge of the geospace plume with subsequent O+ acceleration to >50 keV in <30 min during the ions’ sunward drift.en_US
dc.description.sponsorshipNASA (Contract NAS5‐01072)en_US
dc.publisherFrontiers Media SAen_US
dc.relation.isversionofhttp://dx.doi.org/10.3389/fspas.2021.705637en_US
dc.rightsCreative Commons Attribution 4.0 International licenseen_US
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/en_US
dc.sourceJohn Fosteren_US
dc.titleVan Allen Probes Observations of Oxygen Ions at the Geospace Plumeen_US
dc.typeArticleen_US
dc.identifier.citationFoster, John C. and Philip J. Erickson. "Van Allen Probes Observations of Oxygen Ions at the Geospace Plume." Frontiers in Astronomy and Space Sciences 8 (July 2021): 705637.en_US
dc.contributor.departmentHaystack Observatoryen_US
dc.contributor.approverFoster, John Cen_US
dc.relation.journalFrontiers in Astronomy and Space Sciencesen_US
dc.eprint.versionFinal published versionen_US
dc.type.urihttp://purl.org/eprint/type/JournalArticleen_US
eprint.statushttp://purl.org/eprint/status/PeerRevieweden_US
dspace.date.submission2021-08-06T21:36:10Z
mit.journal.volume8en_US
mit.licensePUBLISHER_CC
mit.metadata.statusComplete


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