Reply on RC1 - Errata corrige

Abstract

Abstract. We present first-light observations of auroral imaging polarimetry with the Polaribotn camera, a monochrome micropolarizer-based instrument equipped with narrowband filtering at the O(1S) 557.7 nm green line. The instrument was operated simultaneously with the Corbel Cru polarimeter during a campaign in Skibotn, Norway, allowing a direct comparison with the existing narrow-field reference framework. The common field of view was identified empirically from the intensity time series, and the Polaribotn measurements show good agreement with Corbel Cru in both degree and angle of linear polarization. Extending the analysis to 63 regions of interest across the full image reveals that DoLP and AoLP do not respond in the same way to auroral structures: DoLP decreases in the brightest arc regions, whereas AoLP often remains coherent over a large fraction of the field of view. The corresponding (q,u) analysis points to a strong scene-wide polarization component with local intensity-dependent perturbations. Although the present dataset does not yet allow a definitive interpretation of the physical origin of the polarization, it demonstrates that auroral imaging polarimetry is feasible and provides spatial information not accessible to previous narrow-field instruments.

Authors 10

1. Gaël Cessateur

   Royal Belgian Institute for Space Aeronomy

   Affiliation as printed

   Royal Belgian Institute for Space Aeronomy, Avenue Circulaire 3, 1180 Brussels, Belgium

2. Jean Lilensten

   Centre National de la Recherche Scientifique · Institut de Planétologie et d'Astrophysique de Grenoble · Université Grenoble Alpes

   Affiliation as printed

   Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France

3. H. Lamy

   Royal Belgian Institute for Space Aeronomy

   Affiliation as printed

   Royal Belgian Institute for Space Aeronomy, Avenue Circulaire 3, 1180 Brussels, Belgium

4. Léo Bosse

   Commissariat à l'Énergie Atomique et aux Énergies Alternatives

   Affiliation as printed

   Centre Opérationnel de Météorologie de l’Espace des Alpes (COMEA), AurorAlpes, 38000, Grenoble, France

5. Magnar G. Johnsen

   UiT The Arctic University of Norway

   Affiliation as printed

   Tromsø Geophysical Observatory, Faculty of Science and Technology, UiT the Arctic University of Norway, 9037 Tromsø, Norway

6. Antonio Guerrero

   Universidad de Alcalá

   Affiliation as printed

   Dpt. Physics and Mathematics, University of Alcala, Alcalá de Henares, Spain

7. David Bolsée

   Royal Belgian Institute for Space Aeronomy

   Affiliation as printed

   Royal Belgian Institute for Space Aeronomy, Avenue Circulaire 3, 1180 Brussels, Belgium

8. Mathieu Barthélémy

   Centre National de la Recherche Scientifique · Institut de Planétologie et d'Astrophysique de Grenoble · Université Grenoble Alpes

   Affiliation as printed

   Univ. Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France

9. Thijs A. Stockmans Aachen Leiden Observatory

   Leiden University · Leiden Observatory

   Affiliation as printed

   Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands

10. Frans Snik Aachen Leiden Observatory

    Leiden University · Leiden Observatory

    Affiliation as printed

    Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden, The Netherlands