Time-lapse of a northern lights display on 11/12 February 2022 from a location not far from Lübeck in Northern Germany.
Main events:
0:48 auroral arc getting brighter
2:05 ray activity
2:38 main substorm, fast moving rays

These images were taken with a full-spectrum-modified Canon 60D and an Astronomik ProPlanet 642 BP IR-pass clip filter. So wavelengths between 642 and 840 nm reach the sensor with this setup.
There are many bright auroral emission lines in the infrared that mainly stem from neutral oxygen atoms.
The infrared auroral features do not seem to reach to high altitudes compared to the RGB-timelapse that I took simultaneously:
[ Ссылка ]
Maybe this is due to the increasing amount of ionized atoms and molecules at higher altitudes (ionosphere).

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