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  First evidence of polarized emissions in pulsating aurorae

Bosse, L., Cessateur, G., Lamy, H., Lilensten, J., Gillet, N., Brogniez, C., Pujol, O. (2023): First evidence of polarized emissions in pulsating aurorae, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-3350

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019622 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019622_2
Genre: Conference Paper

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 Creators:
Bosse, Léo1, Author
Cessateur, Gaël1, Author
Lamy, Hervé1, Author
Lilensten, Jean1, Author
Gillet, Nicolas1, Author
Brogniez, Colette1, Author
Pujol, Olivier1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: In the last decade, several instruments have been developped to measure the auroral light polarisation. However, its study has faced the issue of anthropic light pollution and scattering in the lower atmosphere (Bosse et al., 2020). To overcome this challenge the most succesfull method was the use of a polarised radiative transfer model to identify the light pollution contribution (Bosse et al., 2022). This year, a new look at the data revealed that pulsating aurorae are polarised, and that this polarisation carries a lot of information. Searching for polarisation in pulsating aurorae allows us to dismiss any external source of polarisation that is not synched with the pulsation of the aurora. Thus light pollution is not a problem anymore.These polarisation patterns are seen in the green atomic oxygen line at 557.7 nm, the 1st N2+ negative band at 391.4 nm (purple) and 427.8 nm (blue). Today, there are no clear explanations on the origin of this auroral polarisation, or its relation to the local state of the upper atmosphere. An hypothesis is that 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 will present how these new findings confirm the ionospheric origin of the polarisation observed from the ground, and discussing about the opportunities these observations and models offer in the frame of space weather, aerosol and light pollution study.

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Language(s): eng - English
 Dates: 20232023
 Publication Status: Finally published
 Pages: -
 Publishing info: -
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 Rev. Type: -
 Identifiers: DOI: 10.57757/IUGG23-3350
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Postdam : GFZ German Research Centre for Geosciences
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: - Identifier: -