Titre :

At the source of the polarisation of auroral emissions: experiments and modeling

Auteur(s) :

Bosse, Léo [Auteur]
Institut de Planétologie et d'Astrophysique de Grenoble [IPAG]
Lilensten, Jean [Auteur]
Institut de Planétologie et d'Astrophysique de Grenoble [IPAG]
Royal Observatory of Belgium = Observatoire Royal de Belgique [ROB]
Laboratoire d’Optique Atmosphérique - UMR 8518 [LOA]
Gillet, Nicolas [Auteur]
Institut des Sciences de la Terre [ISTerre]
Brogniez, Colette [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Pujol, Olivier [Auteur]
Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518
Rochat, Sylvain [Auteur]
Institut de Planétologie et d'Astrophysique de Grenoble [IPAG]
Delboulbe, Alain [Auteur]
Institut de Planétologie et d'Astrophysique de Grenoble [IPAG]
Curaba, Stéphane [Auteur]
Institut de Planétologie et d'Astrophysique de Grenoble [IPAG]
Johnsen, Magnar Gullikstad [Auteur]
Tromsø Geophysical Observatory [TGO]

Titre de la revue :

Journal of Space Weather and Space Climate

Nom court de la revue :

J. Space Weather Space Clim.

Numéro :

12

Pagination :

-

Date de publication :

2022-04-17

ISSN :

2115-7251

Mot(s)-clé(s) en anglais :

Auroral lights
Linear polarisation
Radiative transfer
Ionospheric environment

Discipline(s) HAL :

Planète et Univers [physics]/Océan, Atmosphère

Résumé en anglais : [en]

A polarised radiative transfer model (POMEROL) has been developed to compute the polarisation measured by a virtual instrument in a given nocturnal environment. This single-scattering model recreates real-world conditions ...
Lire la suite >A polarised radiative transfer model (POMEROL) has been developed to compute the polarisation measured by a virtual instrument in a given nocturnal environment. This single-scattering model recreates real-world conditions (among them atmospheric and aerosol profiles, light sources with complex geometries at the ground and in the sky, terrain obstructions). It has been successfully tested at mid-latitudes where sky emissions are of weak intensity. We show a series of comparisons between POMEROL predictions and polarisation measurements during two field campaigns in the auroral zone, in both quiet and active conditions. These comparisons show the strength of the model to assess the aerosol characteristics in the lower atmosphere by using a mesospheric line. They also show that three main upper atmosphere emissions must be polarised: the green atomic oxygen line at 557.7 nm and the 1st N2+ negative band at 391.4 nm (purple) and 427.8 nm (blue). This polarisation can be either created directly at the radiative de-excitation or may occur when the non-polarised emission crosses the ionospheric currents. We provide some of the potentialities it offers in the frame of space weather. These require refinements of the preliminary modeling approach considered in the present study.Lire moins >

Langue :

Anglais

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
CNRS

Collections :

• Laboratoire d'Optique Atmosphérique (LOA) - UMR 8518

Date de dépôt :

2024-01-16T22:41:57Z
2024-02-14T14:21:28Z