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dc.contributor.authorMoen, Jøran Idar
dc.contributor.authorOksavik, Kjellmar
dc.contributor.authorAlfonsi, Lucilla
dc.contributor.authorDåbakk, Yvonne Rinne
dc.contributor.authorRomano, Vineenzo
dc.contributor.authorSpogli, Luca
dc.date.accessioned2016-08-03T06:30:16Z
dc.date.available2016-08-03T06:30:16Z
dc.date.issued2013
dc.identifier.citationJournal of Space Weather and Space Climate 2013, 3:A02eng
dc.identifier.urihttp://hdl.handle.net/1956/12399
dc.description.abstractThis paper presents research on polar cap ionosphere space weather phenomena conducted during the European Cooperation in Science and Technology (COST) action ES0803 from 2008 to 2012. The main part of the work has been directed toward the study of plasma instabilities and scintillations in association with cusp flow channels and polar cap electron density structures/patches, which is considered as critical knowledge in order to develop forecast models for scintillations in the polar cap. We have approached this problem by multi-instrument techniques that comprise the EISCAT Svalbard Radar, SuperDARN radars, in-situ rocket, and GPS scintillation measurements. The Discussion section aims to unify the bits and pieces of highly specialized information from several papers into a generalized picture. The cusp ionosphere appears as a hot region in GPS scintillation climatology maps. Our results are consistent with the existing view that scintillations in the cusp and the polar cap ionosphere are mainly due to multi-scale structures generated by instability processes associated with the cross-polar transport of polar cap patches. We have demonstrated that the SuperDARN convection model can be used to track these patches backward and forward in time. Hence, once a patch has been detected in the cusp inflow region, SuperDARN can be used to forecast its destination in the future. However, the high-density gradient of polar cap patches is not the only prerequisite for high-latitude scintillations. Unprecedented high-resolution rocket measurements reveal that the cusp ionosphere is associated with filamentary precipitation giving rise to kilometer scale gradients onto which the gradient drift instability can operate very efficiently. Cusp ionosphere scintillations also occur during IMF BZ north conditions, which further substantiates that particle precipitation can play a key role to initialize plasma structuring. Furthermore, the cusp is associated with flow channels and strong flow shears, and we have demonstrated that the Kelvin-Helmholtz instability process may be efficiently driven by reversed flow events.eng
dc.language.isoengeng
dc.publisherEDP Scienceseng
dc.rightsAttribution CC BYeng
dc.rights.urihttp://creativecommons.org/licenses/by/2.0/eng
dc.subjectionosphereeng
dc.subjectpolar capeng
dc.subjectinstabilitieseng
dc.subjectirregularitieseng
dc.subjectcusp-clefteng
dc.titleSpace weather challenges of the polar cap ionosphereeng
dc.typeJournal articleeng
dc.subject.nsiVDP::Matematikk og naturvitenskap: 400::Geofag: 450::Meteorologi: 453
dc.subject.nsiVDP::Mathematics and natural scienses: 400::Geosciences: 450::Meteorology: 453
dc.date.updated2016-04-11T12:45:51Z
dc.rights.holderCopyright J. Moen et al.eng
dc.type.versionpublishedVersioneng
bora.peerreviewedPeer reviewedeng
dc.type.documentJournal article
dc.identifier.cristinID1048401
dc.identifier.doi10.1051/swsc/2013025eng
dc.source.issn2115-7251eng
dc.relation.projectIDNorges forskningsråd: 212014
dc.relation.projectIDNorges forskningsråd: 208006


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