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dc.contributor.authorBarthélemy, Mathieu
dc.contributor.authorLamy, Hervé
dc.contributor.authorVialatte, Anne
dc.contributor.authorJohnsen, Magnar Gullikstad
dc.contributor.authorCessateur, G
dc.contributor.authorZaourar, N
dc.date.accessioned2019-08-06T12:05:02Z
dc.date.available2019-08-06T12:05:02Z
dc.date.issued2019-07-16
dc.description.abstractIn this paper, we provide for the first time polarisation measurements of the <i>N</i><sup>+</sup><sub>2</sub> band at 427.8 nm performed with Premier Cru, a dedicated spectropolarimeter to investigate the polarisation of auroral emission lines between 400 and 700 nm. Details about the instrument, the observing conditions and the data analysis procedure are provided. Results obtained during three nights in March 2017 in Skibotn, Norway, indicate that the auroral blue line is polarised with a degree of linear polarisation of a few %. Due to weak Signal-to-Noise Ratios (SNR), these measurements still need to be taken with caution since none of the individual data set has a detection with a 3σ confidence level. However, results integrated over the entire observing period each night do show a 3σ detection but due to the long integration period, the origin of this polarisation cannot be linked to a specific type of aurora (diffuse vs structured arc) or specific ionospheric or geomagnetic conditions. These observations need to be confirmed with an improved design to increase the SNR and decrease the exposure time. When available, these improved measurements of the blue line polarisation will be important to better understand the physics of auroral processes at altitudes below 100 km where the N<sub>2</sub><sup>+</sup> emission occurs and possibly for space weather applications if the polarisation varies with ionospheric/geomagnetic conditions.en_US
dc.description.sponsorshipOSUG@2020 labex PNST (French National program for Solar Terrestrial relation)en_US
dc.descriptionSource at <a href=https://doi.org/10.1051/swsc/2019024>https://doi.org/10.1051/swsc/2019024. </a>en_US
dc.identifier.citationBarthélemy, M., Lamy, H., Vialatte, A., Johnsen, M.G., Cessateur, G. & Zaourar, N. (2019). Measurement of the polarisation in the auroral N<sub>2</sub><sup>+</sup> 427.8 nm band. <i>Journal of Space Weather and Space Climate, 9</i>, A26. https://doi.org/10.1051/swsc/2019024en_US
dc.identifier.cristinIDFRIDAID 1713038
dc.identifier.doihttps://doi.org/10.1051/swsc/2019024
dc.identifier.issn2115-7251
dc.identifier.urihttps://hdl.handle.net/10037/15859
dc.language.isoengen_US
dc.publisherEDP Openen_US
dc.relation.journalJournal of Space Weather and Space Climate
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Physics: 430en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Fysikk: 430en_US
dc.subjectpolarisationen_US
dc.subjectauroraen_US
dc.subjectspace weather-ionosphere-instrumentationen_US
dc.titleMeasurement of the polarisation in the auroral N2+ 427.8 nm banden_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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