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dc.contributor.authorHori, Tomoakija
dc.contributor.authorShinbori, Atsukija
dc.contributor.authorFujita, Shigeruja
dc.contributor.authorNishitani, Nozomuja
dc.contributor.alternative新堀, 淳樹ja
dc.date.accessioned2016-05-19T05:34:32Z-
dc.date.available2016-05-19T05:34:32Z-
dc.date.issued2015-11-25ja
dc.identifier.issn1880-5981ja
dc.identifier.urihttp://hdl.handle.net/2433/212423-
dc.description.abstractA statistical study using a large dataset of Super Dual Auroral Radar Network (SuperDARN) observations is conducted for transient ionospheric plasma flows associated with sudden impulses (SI) recorded on ground magnetic field. The global structure of twin vortex-like ionospheric flows is found to be consistent with the twin vortices of ionospheric Hall current deduced by the past geomagnetic field observations. An interesting feature, which is focused on in this study, is that the flow structures show a dawn-dusk asymmetry depending on the combination of the polarity of SI and interplanetary magnetic field (IMF)-By. Detailed statistics of the SuperDARN observations reveal that the dawn-dusk asymmetry of flow vortices due to IMF-By appears during negative SIs, while such asymmetric characteristics are not seen during positive SIs. On the basis of the upstream observations, we suggest that this particular dawn-dusk asymmetry is caused by the interaction between the pre-existing round convection cell and a pair of the transient convection vortices associated with SIs.ja
dc.format.mimetypeapplication/pdfja
dc.language.isoengja
dc.publisherSpringerOpenja
dc.rights© 2015 Hori et al. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.ja
dc.subjectSudden impulseja
dc.subjectIonospheric plasma convectionja
dc.subjectSuperDARNja
dc.titleIMF-By dependence of transient ionospheric flow perturbation associated with sudden impulses: SuperDARN observationsja
dc.type.niitypeJournal Articleja
dc.identifier.jtitleEarth, Planets and Spaceja
dc.identifier.volume67ja
dc.relation.doi10.1186/s40623-015-0360-6ja
dc.textversionpublisherja
dc.identifier.artnum190ja
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