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dc.contributor.authorYue, Chaoen_US
dc.contributor.authorBortnik, Jacoben_US
dc.contributor.authorLi, Wenen_US
dc.contributor.authorMa, Qianlien_US
dc.contributor.authorWang, Chih-Pingen_US
dc.contributor.authorThorne, Richard M.en_US
dc.contributor.authorLyons, Larryen_US
dc.contributor.authorReeves, Geoffrey D.en_US
dc.contributor.authorSpense, Harlan E.en_US
dc.contributor.authorGerrard, Andrew J.en_US
dc.contributor.authorGkioulidou, Matinaen_US
dc.contributor.authorMitchell, Donald G.en_US
dc.date.accessioned2020-05-01T18:20:13Z
dc.date.available2020-05-01T18:20:13Z
dc.date.issued2019-09-01
dc.identifier.citationChao Yue, Jacob Bortnik, Wen Li, Qianli Ma, Chih-Ping Wang, Richard Thorne, Larry Lyons, Geoffrey Reeves, Harlan Spense, Andrew Gerrard, Matina Gkioulidou, Donald Mitchell. 2019. "Oxygen Ion Dynamics in the Earth's Ring Current: Van Allen Probes Observations." Journal of Geophysical Research: Space Physics, Volume 124, Issue 10, pp. 7786-7798 https://doi.org/10.1029/2019JA026801
dc.identifier.issn2169-9380
dc.identifier.urihttps://hdl.handle.net/2144/40507
dc.description.abstractOxygen (O+) enhancements in the inner magnetosphere are often observed during geomagnetically active times, such as geomagnetic storms. In this study, we quantitatively examine the difference in ring current dynamics with and without a substantial O+ ion population based on almost 6 years of Van Allen Probes observations. Our results have not only confirmed previous finding of the role of O+ ions to the ring current but also found that abundant O+ ions are always present during large storms when sym-H < -60 nT without exception, whilst having the pressure ratio (𝓡) between O+ and proton (H+) larger than 0.8 and occasionally even larger than 1 when L < 3. Simultaneously, the pressure anisotropy decreases with decreasing sym-H and increasing L shell. The pressure anisotropy decrease during the storm main phase is likely related to the pitch angle isotropization processes. In addition, we find that 𝓡 increases during the storm main phase and then decreases during the storm recovery phase, suggesting faster buildup and decay of O+ pressure compared to H+ ions, which are probably associated with some species dependent source and/or energization as well as loss processes in the inner magnetosphere.en_US
dc.format.extentp. 7786-7798en_US
dc.language.isoen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.ispartofJournal of Geophysical Research: Space Physics
dc.titleOxygen ion dynamics in the Earth's ring current: Van Allen probes observationsen_US
dc.typeArticleen_US
dc.description.versionAccepted manuscripten_US
dc.identifier.doi10.1029/2019JA026801
pubs.elements-sourcemanual-entryen_US
pubs.notesEmbargo: Not knownen_US
pubs.organisational-groupBoston Universityen_US
pubs.organisational-groupBoston University, College of Arts & Sciencesen_US
pubs.organisational-groupBoston University, College of Arts & Sciences, Department of Astronomyen_US
pubs.publication-statusPublisheden_US
dc.identifier.orcid0000-0003-3495-4550 (Li, Wen)
dc.identifier.mycv519780


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