dc.contributor.author | Foster, John C | |
dc.contributor.author | Erickson, Philip J | |
dc.date.accessioned | 2021-08-10T21:58:53Z | |
dc.date.available | 2021-08-10T21:58:53Z | |
dc.date.issued | 2021-07 | |
dc.date.submitted | 2021-05 | |
dc.identifier.issn | 2296-987X | |
dc.identifier.uri | https://hdl.handle.net/1721.1/131170 | |
dc.description.abstract | The 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 (&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.sponsorship | NASA (Contract NAS5‐01072) | en_US |
dc.publisher | Frontiers Media SA | en_US |
dc.relation.isversionof | http://dx.doi.org/10.3389/fspas.2021.705637 | en_US |
dc.rights | Creative Commons Attribution 4.0 International license | en_US |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | en_US |
dc.source | John Foster | en_US |
dc.title | Van Allen Probes Observations of Oxygen Ions at the Geospace Plume | en_US |
dc.type | Article | en_US |
dc.identifier.citation | Foster, 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.department | Haystack Observatory | en_US |
dc.contributor.approver | Foster, John C | en_US |
dc.relation.journal | Frontiers in Astronomy and Space Sciences | en_US |
dc.eprint.version | Final published version | en_US |
dc.type.uri | http://purl.org/eprint/type/JournalArticle | en_US |
eprint.status | http://purl.org/eprint/status/PeerReviewed | en_US |
dspace.date.submission | 2021-08-06T21:36:10Z | |
mit.journal.volume | 8 | en_US |
mit.license | PUBLISHER_CC | |
mit.metadata.status | Complete | |