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TWINS Observations of the Dynamics of Ring Currents Ion Spectra on March 17 and October 7, 2015


Metadata FieldValueLanguage
dc.contributorS. Shekhar, sap.shekh@gmail.comen_US
dc.creatorShekhar, S
dc.creatorPerez, J
dc.creatorFerradas, C
dc.date.accessioned2022-10-27T13:39:51Z
dc.date.available2022-10-27T13:39:51Z
dc.date.created2021
dc.identifier10.1029/2020JA028156en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2020JA028156en_US
dc.identifier.urihttps://aurora.auburn.edu/handle/11200/50429
dc.identifier.urihttp://dx.doi.org/10.35099/aurora-497
dc.description.abstractDirect comparisons between RBSP (Van Allen Probes or Radiation Belt Storm Probes) and TWINS (Two Wide-angle Imaging Neutral-atom Spectrometers) for the main phase of two storms, March 17 and October 7, 2015, showed agreement between the in situ ion measurements and the ion spectra from the deconvolved energetic neutral-atom (ENA) measurements, except when O+ ions were significant. Spatial evolution of individual energy peaks in the ion spectra is studied using TWINS data. O+ ions are seen to result in intense peaks at 5-10 keV/amu in the TWINS ion spectra. These ion populations are confined to low L shells (L < 5) and localized in the premidnight sector. When H+ ions are significant, the low energy peaks (<25 keV/amu) are found to be less intense than the high energy peaks (>25 keV/amu), located at L > 4 and localized within the premidnight sector. During times of rapidly varying AE indices, two spatially distinct peaks, between 3-5R(E) and 6-8R(E), are observed for the ions with energies >25 keV/amu. The outer peak appears for a few hours and fades while the inner peak is more stable. These structures are found to be consistent with particle injections observed in the RBSP data. When double peaked structures are swept off, low energy ions accumulate in the premidnight to midnight sectors whereas high energy ions are located premidnight to postmidnight sectors. Faster drift orbits of >25 keV/amu ions may cause this kind of distribution.en_US
dc.formatPDFen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.ispartofJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICSen_US
dc.relation.ispartofseries2169-9380en_US
dc.rights©American Geophysical Union 2021. This is this the version of record co-published by the American Geophysical Union and John Wiley & Sons, Inc. It is made available under the CC-BY-NC-ND 4.0 license. Item should be cited as: Shekhar, S., Perez, J. D., & Ferradas, C. P. (2021). TWINS observations of the dynamics of ring currents ion spectra on March 17 and October 7, 2015. Journal of Geophysical Research: Space Physics, 126(2), e2020JA028156.en_US
dc.titleTWINS Observations of the Dynamics of Ring Currents Ion Spectra on March 17 and October 7, 2015en_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume126en_US
dc.citation.issue2en_US
dc.description.statusPublisheden_US
dc.description.peerreviewYesen_US
dc.creator.orcid0000-0002-2815-4998en_US
dc.creator.orcid0000-0002-5619-9093en_US
dc.creator.orcid0000-0002-6931-1793en_US

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