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dc.contributor.authorBjoland, Lindis Merete
dc.contributor.authorOgawa, Y.
dc.contributor.authorLøvhaug, Unni Pia
dc.contributor.authorLorentzen, Dag Arne
dc.contributor.authorHatch, Spencer Mark
dc.contributor.authorOksavik, Kjellmar
dc.date.accessioned2022-02-01T14:18:28Z
dc.date.available2022-02-01T14:18:28Z
dc.date.issued2021-12-16
dc.description.abstractThis paper presents and discusses electron density depletion regions observed with the incoherent scatter EISCAT Svalbard Radar (ESR) located at 75.43°N geomagnetic latitude. The data include several decades of measurements, which make them suitable for studying statistical features and characteristics of the ionospheric parameters. Here we focus on the electron density depletions and their dependence on diurnal and seasonal variations and solar activity. An electron density depletion region is identified in the ESR data in the early morning sector. This depletion region seems to be clearest during equinox and winter and moderate/high solar activity. An enhancement in the ion temperature is often co-located with the electron density depletion region. The ion temperature enhancement could indicate that ion frictional heating is related to the electron density depletion region. However, during summer when the solar activity is low, the electron density depletion is not observed although the ion temperature is enhanced, suggesting that formation of the electron density depletion regions due to ion frictional heating may depend on the background effective temperature and O/N2 ratio. In addition, seasonal changes in the solar zenith angle could also contribute to the formation of the depletion region.en_US
dc.identifier.citationBjoland, Ogawa, Løvhaug, Lorentzen, Hatch, Oksavik. Electron Density Depletion Region Observed in the Polar Cap Ionosphere. Journal of Geophysical Research (JGR): Space Physics. 2021;126(1)en_US
dc.identifier.cristinIDFRIDAID 1977917
dc.identifier.doi10.1029/2020JA028432
dc.identifier.issn2169-9380
dc.identifier.issn2169-9402
dc.identifier.urihttps://hdl.handle.net/10037/23876
dc.language.isoengen_US
dc.publisherWileyen_US
dc.relation.ispartofThis article is partly based on the submitted manuscript in the following publication: <p> <p>Bjoland, L.M. (2018). Radar studies of plasma parameters in the polar cap and the auroral zone (Doctoral thesis). <a href=https://hdl.handle.net/10037/31573>https://hdl.handle.net/10037/31573</a>.
dc.relation.journalJournal of Geophysical Research (JGR): Space Physics
dc.relation.projectIDNorges forskningsråd: 223252en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/SFF/223252/Norway/Birkeland Center for Space Science/BCSS/en_US
dc.relation.urihttps://doi.org/10.1029/2020JA028432
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2021 The Author(s)en_US
dc.titleElectron Density Depletion Region Observed in the Polar Cap Ionosphereen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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