First observations of continuum emission in dayside aurora

Partamies, Noora; Dayton-Oxland, Rowan; Herlingshaw, Katie; Virtanen, Ilkka; Gallardo-Lacourt, Bea; Syrjäsuo, Mikko; Sigernes, Fred; Nishiyama, Takanori; Nishimura, Toshi; Barthelemy, Mathieu; Aruliah, Anasuya; Whiter, Daniel; Mielke, Lena; Grandin, Maxime; Karvinen, Eero; Spijkers, Marjan; Ledvina, Vincent E.

doi:https://doi.org/10.5194/angeo-43-349-2025

Articles | Volume 43, issue 2

https://doi.org/10.5194/angeo-43-349-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/angeo-43-349-2025

© Author(s) 2025. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 43, issue 2

Regular paper

| Highlight paper

|

03 Jul 2025

Regular paper | Highlight paper |

| 03 Jul 2025

First observations of continuum emission in dayside aurora

Noora Partamies, Rowan Dayton-Oxland, Katie Herlingshaw, Ilkka Virtanen, Bea Gallardo-Lacourt, Mikko Syrjäsuo, Fred Sigernes, Takanori Nishiyama, Toshi Nishimura, Mathieu Barthelemy, Anasuya Aruliah, Daniel Whiter, Lena Mielke, Maxime Grandin, Eero Karvinen, Marjan Spijkers, and Vincent E. Ledvina

Data sets

First observations of continuum emission in dayside aurora N. Partamies https://doi.org/10.5281/zenodo.13960606

OMNI 1-min Data Natalia E. Papitashvili and Joseph H. King https://doi.org/10.48322/45bb-8792

Model code and software

Bayesian Filtering Module (v0.2) I. I. Virtanen https://doi.org/10.5281/zenodo.10656396

amisr/flipchem: v2021.2.2 Bugfix Release (v2021.2.2) Ashton Reimer et al. https://doi.org/10.5281/zenodo.5719844

Software for Meridian Imaging Svalbard Spectrograph (MISS) Mikko Syrjäsuo https://github.com/UNISvalbard/KHO-MISS

Star calibration of all-sky images Mikko Syrjäsuo https://github.com/UNISvalbard/KHO-starcalibration

Video supplement

First observations of continuum emission in dayside aurora N. Partamies https://doi.org/10.5281/zenodo.13960606

Editor-in-chief

The manuscript reports the first observations of continuum emission at the poleward boundary of the dayside auroral oval. The unique measurements show that a number of different emission lines and bands contribute to the broadband continuum emission. Even emission structures in the near and far infrared were observed, suggesting that multiple emitting species are responsible for the observed spectral enhancements. The authors suggest that the interplay of different heating mechanisms may be an important factor in the generation of high-latitude continuum emissions.