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dc.contributor.authorKwagala, Norah Kaggwa
dc.contributor.authorOksavik, Kjellmar
dc.contributor.authorLorentzen, Dag Arne
dc.contributor.authorJohnsen, Magnar Gullikstad
dc.PublishedKwagala NK, Oksavik K, Lorentzen DA, Johnsen MG. How Often Do Thermally Excited 630.0 nm Emissions Occur in the Polar Ionosphere?. Journal of Geophysical Research - Space Physics. 2018;123(1);698-710eng
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−3), 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 × 1011 m−3), 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.publisherAmerican Geophysical Unionen_US
dc.rightsAttribution CC BY-NC-NDeng
dc.titleHow Often Do Thermally Excited 630.0 nm Emissions Occur in the Polar Ionosphere?en_US
dc.typePeer reviewed
dc.typeJournal article
dc.rights.holderCopyright 2017 The Author(s)en_US
dc.source.journalJournal of Geophysical Research - Space Physics
dc.relation.projectNorges forskningsråd: 223252

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