Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 41, issue 1
Articles | Volume 41, issue 1
https://doi.org/10.5194/angeo-41-1-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-41-1-2023
© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 41, issue 1
Regular paper
 | 
06 Jan 2023
Regular paper |  | 06 Jan 2023

The altitude of green OI 557.7 nm and blue N2+ 427.8 nm aurora

Daniel K. Whiter, Noora Partamies, Björn Gustavsson, and Kirsti Kauristie

Data sets

MIRACLE All-Sky Cameras Finnish Meteorological Institute https://space.fmi.fi/MIRACLE/ASC/

Solar radio flux - archive of measurements Space Weather Canada https://spaceweather.gc.ca/forecast-prevision/solar-solaire/solarflux/sx-5-en.php

GFZ Data Services: Geomagnetic Kp index, V. 1.0 Jürgen Matzka, Oliver Bronkalla, Katrin Tornow, Katrin Elger and Claudia Stolle https://doi.org/10.5880/Kp.0001

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Short summary
We measured the height of green and blue aurorae using thousands of camera images recorded over a 7-year period. Both colours are typically brightest at about 114 km altitude. When they peak at higher altitudes the blue aurora is usually higher than the green aurora. This information will help other studies which need an estimate of the auroral height. We used a computer model to explain our observations and to investigate how the green aurora is produced.
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