Can polarisation measurements of auroral emissions trace the ionospheric currents? A case-study ...
<!--!introduction!--> Recent observations with spectro-photo-polarimeters have shown that the auroral emissions from oxygen at 577.7 nm (green line), and from the N2+ 1st negative band emissions at 427.8 nm (blue line) and 391.4 nm (purple line) are polarized at a few percent level and that th...
| Main Authors: | , , |
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| Format: | Conference Object |
| Language: | English |
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GFZ German Research Centre for Geosciences
2023
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| Subjects: | |
| Online Access: | https://dx.doi.org/10.57757/iugg23-3306 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5019701 |
| Summary: | <!--!introduction!--> Recent observations with spectro-photo-polarimeters have shown that the auroral emissions from oxygen at 577.7 nm (green line), and from the N2+ 1st negative band emissions at 427.8 nm (blue line) and 391.4 nm (purple line) are polarized at a few percent level and that this polarization is linked to geomagnetic activity and cannot be explained by light pollution only. The origin of this polarization is still puzzling and could be related to ionospheric currents, either field-aligned or horizontal Pedersen/Hall currents. In November 2022, we set-up a multi-instrument observing campaign in Norway in order to better understand this situation. At the Skibotn observatory, we used two instruments dedicated to the measurements of auroral light polarization : PLIP, a Polar Lights Imaging Polarimeter, able to measure polarization of the three main auroral emissions (green, red and blue) on a large FOV (~44° × 30°) on the sky, and Corbel Cru, a spectro-photo polarimeter able to measure ... : The 28th IUGG General Assembly (IUGG2023) (Berlin 2023) ... |
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