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dc.contributor.authorKwagala, Norah Kaggwa
dc.contributor.authorOksavik, Kjellmar
dc.contributor.authorLorentzen, Dag Arne
dc.contributor.authorJohnsen, Magnar Gullikstad
dc.date.accessioned2018-06-28T09:01:25Z
dc.date.available2018-06-28T09:01:25Z
dc.date.issued2017-12-17
dc.description.abstractThis paper studies thermally excited emissions in the polar ionosphere derived from European Incoherent Scatter Svalbard radar measurements from the years 2000–2015. The peak occurrence is found around magnetic noon, where the radar observations show cusp-like characteristics. The ionospheric, interplanetary magnetic field and solar wind conditions favor dayside magnetic reconnection as the dominant driving process. The thermal emissions occur 10 times more frequently on the dayside than on the nightside, with an average intensity of 1–5 kR. For typical electron densities in the polar ionosphere (2 × 1011 m<sup>−3</sup>), we find the peak occurrence rate to occur for extreme electron temperatures (>3000 K), which is consistent with assumptions in literature. However, for extreme electron densities (>5 × 10<sup>11</sup> m<sup>−3</sup>), we can now report on a completely new population of thermal emissions that may occur at much lower electron temperatures (∼2300 K). The empirical atmospheric model (NRLMSISE-00) suggests that the latter population is associated with enhanced neutral atomic oxygen densities.en_US
dc.descriptionSource at: <a href=http://doi.org/10.1002/2017JA024744> http://doi.org/10.1002/2017JA024744 </a>en_US
dc.identifier.citationKwagala, N. K., Oksavik, K., Lorentzen, D. A. & Johnsen, M. G. (2017). How Often Do Thermally Excited 630.0 nm Emissions Occur in the Polar Ionosphere? Journal of Geophysical Research - Space Physics, 122. http://doi.org/10.1002/2017JA024744en_US
dc.identifier.cristinIDFRIDAID 1536721
dc.identifier.doi10.1002/2017JA024744
dc.identifier.issn2169-9380
dc.identifier.issn2169-9402
dc.identifier.urihttps://hdl.handle.net/10037/13045
dc.language.isoengen_US
dc.publisherAmerican Geophysical Unionen_US
dc.relation.journalJournal of Geophysical Research - Space Physics
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/FundingProgram/223252/Norway/Birkeland Center for Space Science /BCSS/en_US
dc.relation.urihttp://onlinelibrary.wiley.com/doi/10.1002/2017JA024744/abstract
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Petroleumsgeologi og -geofysikk: 464en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Petroleum geology and petroleum geophysics: 464en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430en_US
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430en_US
dc.titleHow Often Do Thermally Excited 630.0 nm Emissions Occur in the Polar Ionosphere?en_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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