Title :

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

Author(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]

Journal title :

Journal of Space Weather and Space Climate

Abbreviated title :

J. Space Weather Space Clim.

Volume number :

12

Pages :

-

Publication date :

2022-04-17

ISSN :

2115-7251

English keyword(s) :

Auroral lights
Linear polarisation
Radiative transfer
Ionospheric environment

HAL domain(s) :

Planète et Univers [physics]/Océan, Atmosphère

English abstract : [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 ...
Show more >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.Show less >

Language :

Anglais

Audience :

Internationale

Popular science :

Non

Administrative institution(s) :

Université de Lille
CNRS

Collections :

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

Submission date :

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