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    Measurement of the polarisation in the auroral N₂+ 427.8 nm band

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    Authors
    Barthelemy, M.
    Lamy, H.
    Vialatte, A.
    Gullikstad Johnsen, M.
    Cessateur, G.
    Zaourar, N.
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    Discipline
    Physical sciences
    Subject
    polarisation
    aurora
    space weather-ionosphere-instrumentation
    Audience
    Scientific
    Date
    2019
    Metadata
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    Description
    In this paper, we provide for the first time polarisation measurements of the N+2 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 N2+ emission occurs and possibly for space weather applications if the polarisation varies with ionospheric/geomagnetic conditions.
    Citation
    Barthelemy, M.; Lamy, H.; Vialatte, A.; Gullikstad Johnsen, M.; Cessateur, G.; Zaourar, N. (2019). Measurement of the polarisation in the auroral N₂+ 427.8 nm band. , Journal of Space Weather and Space Climate, Vol. 9, A26, DOI: 10.1051/swsc/2019024.
    Identifiers
    uri: https://orfeo.belnet.be/handle/internal/7336
    doi: http://dx.doi.org/10.1051/swsc/2019024
    Type
    Article
    Peer-Review
    Yes
    Language
    eng
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