POLARLIS a solar cycle (POLARLIS Solar Cycle)

Continuation of the ongoing project to observe the auroral polarisation over a long period of time (several winters)

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Project type

  • remote sensing


  • atmosphere
  • space physics

Project Keywords

  • sun-earth interactions / ionosphere/magnetosphere dynamics / aurorae

Fieldwork information

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Type Period From To Coordinates Station Location
{{fieldwork.type}} {{fieldwork.mapType}} {{fieldwork.period}} {{fieldwork.startDate}} {{fieldwork.endDate}} E{{fieldwork.utm33East}}, N{{fieldwork.utm33North}}
{{ | number : 6}}°N, {{fieldwork.long | number : 6}}°E
{{fieldwork.baseStation}} {{fieldwork.location}}


The red line is a triplet at 630.0, 636.4 and 639.2 nm and is one of the most intense lines in the auroral spectrum. It originates in the deactivation of the metastable O1D state. The polarisation of the thermospheric atomic oxygen red line at 630 nm was discovered in Lilensten et al. (2008) with a dedicated Photo Polarimeter (SPP). Since then, several major steps have been performed: - Observation of the behaviour of the Degree of Linear Polarisation (DoLP) with the geomagnetic activity and observation of the Angle of Linear Polarisation (AoLP) at angle with the magnetic field (Barthélemy et al., 2010). - First determination of the calibrated DoLP from the Hornsund campaign (Lilensten et al., 2013), funded by IPEV - First theoretical modeling of the degree of linear polarisation and comparison with observations (Lilensten et al., 2015) - First full wintering in Ny Alesund (2014 / 2015) in order to start the observation of the polarisation parameters over one ½ solar cycle, funded by IPEV. - First tracking of the magnetic field configuration through the AoLP during the February 2015 campaign at Ny Alesund campaign (Lilensten et al., 2016), funded by IPEV This proposal is an extension of the proposal 1026. It is now desirable to perform long term measurements. Long term means at least over ½ a solar cycle (about 6 years) from the same observation position. The goal is to link the polarisation to the solar activity to make it a new space weather window on our space environment. We already have a few months from Hornsund, and a few months from Ny Alesund. We propose here to complete this series of observations for the next 4 winters at Ny Alesund.

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