“Trunk-like” heavy ion structures observed by the Van Allen Probes

dc.citation.firstpage8738en_US
dc.citation.issueNumber10en_US
dc.citation.journalTitleJournal of Geophysical Research: Space Physicsen_US
dc.citation.lastpage8748en_US
dc.citation.volumeNumber120en_US
dc.contributor.authorZhang, J.-C.en_US
dc.contributor.authorKistler, L.M.en_US
dc.contributor.authorSpence, H.E.en_US
dc.contributor.authorWolf, R.A.en_US
dc.contributor.authorReeves, G.en_US
dc.contributor.authorSkoug, R.en_US
dc.contributor.authorFunsten, H.en_US
dc.contributor.authorLarsen, B.A.en_US
dc.contributor.authorNiehof, J.T.en_US
dc.contributor.authorMacDonald, E.A.en_US
dc.contributor.authorFriedel, R.en_US
dc.contributor.authorFerradas, C.P.en_US
dc.contributor.authorLuo, H.en_US
dc.date.accessioned2017-05-12T17:10:13Z
dc.date.available2017-05-12T17:10:13Z
dc.date.issued2015en_US
dc.description.abstractDynamic ion spectral features in the inner magnetosphere are the observational signatures of ion acceleration, transport, and loss in the global magnetosphere. We report “trunk-like” ion structures observed by the Van Allen Probes on 2 November 2012. This new type of ion structure looks like an elephant's trunk on an energy-time spectrogram, with the energy of the peak flux decreasing Earthward. The trunks are present in He+ and O+ ions but not in H+. During the event, ion energies in the He+ trunk, located at L = 3.6–2.6, magnetic local time (MLT) = 9.1–10.5, and magnetic latitude (MLAT) = −2.4–0.09°, vary monotonically from 3.5 to 0.04 keV. The values at the two end points of the O+ trunk are energy = 4.5–0.7 keV, L = 3.6–2.5, MLT = 9.1–10.7, and MLAT = −2.4–0.4°. Results from backward ion drift path tracings indicate that the trunks are likely due to (1) a gap in the nightside ion source or (2) greatly enhanced impulsive electric fields associated with elevated geomagnetic activity. Different ion loss lifetimes cause the trunks to differ among ion species.en_US
dc.identifier.citationZhang, J.-C., Kistler, L.M., Spence, H.E., et al.. "“Trunk-like” heavy ion structures observed by the Van Allen Probes." <i>Journal of Geophysical Research: Space Physics,</i> 120, no. 10 (2015) Wiley: 8738-8748. http://dx.doi.org/10.1002/2015JA021822.
dc.identifier.doihttp://dx.doi.org/10.1002/2015JA021822en_US
dc.identifier.urihttps://hdl.handle.net/1911/94237
dc.language.isoengen_US
dc.publisherWiley
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
dc.title“Trunk-like” heavy ion structures observed by the Van Allen Probesen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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