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Global images of trapped ring current ions during main phase of 17 March 2015 geomagnetic storm as observed by TWINS


Metadata FieldValueLanguage
dc.contributorJ. D. Perezen_US
dc.creatorPerez, J. D.
dc.creatorGoldstein, J.
dc.creatorMcComas, D. J.
dc.creatorValek, P.
dc.creatorFok, M-C
dc.creatorHwang, Kyoung-Joo
dc.date.accessioned2020-06-03T13:26:16Z
dc.date.available2020-06-03T13:26:16Z
dc.date.created2016-07
dc.identifier10.1002/2016JA022375en_US
dc.identifier.urihttps://agupubs.onlinelibrary.wiley.com/doi/abs/10.1002/2016JA022375en_US
dc.identifier.urihttp://hdl.handle.net/11200/49842
dc.description.abstractA unique view of the trapped particles in the inner magnetosphere provided by energetic neutral atom (ENA) imaging is used to observe the dynamics of the spatial structure and the pitch angle anisotropy on a global scale during the last 6h of the main phase of a large geomagnetic storm (minimum SYM-H=-230nT) that began on 17 March 2015. Ion flux and pressure anisotropy obtained from Two Wide-angle Imaging Neutral-atom Spectrometers (TWINS) ENA images are shown. The ion flux shows two peaks, an inner one at approximately radii=3-4 R-E in the dusk-to-midnight sector and an outer peak at radii=8-9 R-E prior to midnight. The inner peak is relatively stationary during the entire period with some intensification during the final steep decline in SYM-H to its minimum. The outer peak shows the significant temporal variation brightening and dimming and finally disappearing at the end of the main phase. The pressure anisotropy shows the expected perpendicular pitch angles inside of L=6 but shows parallel pitch angles at greater L values. This is interpreted as consistent with pitch angle-dependent drift as modeled in the Tsy05 magnetic field and Comprehensive Inner Magnetosphere-Ionosphere simulations. The TWINS results are compared directly with Radiation Belt Storm Probes Ion Composition Experiment (RBSPICE)-A measurements. Using 15min snapshots of flux and pressure anisotropy from TWINS along the path of RBSPICE-A during the 6h focused upon in this study, the essential features displayed in the TWINS global images are supported.en_US
dc.formatPDFen_US
dc.publisherAMER GEOPHYSICAL UNIONen_US
dc.relation.ispartofJOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICSen_US
dc.relation.ispartofseries2169-9380en_US
dc.subjectring current; TWINS; RBSPICEen_US
dc.subjectENERGETIC NEUTRAL ATOM; PITCH-ANGLE DISTRIBUTIONS; INNER MAGNETOSPHERE; ENA IMAGES; SUBSTORM; DYNAMICS; HENAen_US
dc.titleGlobal images of trapped ring current ions during main phase of 17 March 2015 geomagnetic storm as observed by TWINSen_US
dc.typeTexten_US
dc.type.genreJournal Article, Academic Journalen_US
dc.citation.volume121en_US
dc.citation.issue7en_US
dc.citation.spage6509en_US
dc.citation.epage6525en_US
dc.description.statusPublisheden_US

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