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Comparison of Thermospheric Auroral Red Line Polarization

We compare theoretical and observational data of auroral red line polarization during a coordinated campaign in the Svalbard archipelago in February 2012. The discrepancy observed may provide insights into the scattering phase function. The results could be valuable for space weather applications.

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Comparison of Thermospheric Auroral Red Line Polarization

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  1. The thermospheric auroral red line polarization: comparisonbetweentheory and observationsJ. Lilensten, V. Bommier, M. Barthélemy, D. Bernard, H. Lamy, J. Moen, M. G. Johnsen, U. P. Løvhaug and F. Pitout We present here a comparison between observations and theoretical polarization of the auroral red line during a coordinated observing campaign in February 2012 in the Svalbard archipelago. The measured DoLP is 1.92% ± 0.12%.The computed DoLP maximizes at 213 km with a value of 1.79%. We discuss this discrepancy and show that it may give access to the scattering phase function, which is a parameter that cannot be measured in laboratory for the atomic oxygen. However, the DoLP varies significantly with different parameters showing that the solution is degenerated. It could become a tool for space weather applications if used along with other thermosphere/ionosphere measurements.

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