A Showing of STEVE

This short video compiles still images, time-lapses and real-time videos of the Kp5-level aurora of August 7-8, 2022, which included a fine showing of the STEVE arc that often appears equator-ward of a strong display of aurora.
STEVE = Strong Thermal Emission Velocity Enhancement and is a river a hot gas flowing from east to west, not a normal aurora created by electrons raining down from the magnetosphere. The phenomenon was identified as something unique and worthy of study in 2016, though it has been sighted for decades prior.
STEVE appears to the eye as a colourless band but the camera picks up a pink or mauve colour, often with green “fingers” along the edge, the “picket-fence” effect. These do seem to be created by precipitating electrons. This night, after the fingers faded, a green rim did appear along the south edge of the main arc.
The real-time video records the flow of the STEVE gas, moving from east to west.
The location was southern Alberta, Canada, where we are often well-positioned to sight sub-auroral (i.e. south of the main auroral band) phenomena like STEVE and SAR arcs.
TECHNICAL:
The sequences of STEVE were taken with three cameras: a Canon R5 with a 15-35mm lens at 20mm on a tracker, a Canon R6 with a TTArtisan 11mm full-frame fish-eye lens, and a Canon Ra with a TTArtisan 7.5mm circular fish-eye lens. Exposures for the time-lapses were 20 to 30 seconds each.
The real-time videos were shot with the Canon R6 and a TTArtisan 21mm lens at f/1.5 and with the camera at ISO 51,200 and a dragged 1/8-sec shutter speed and in Canon Log3 mode. Colour grading applied in Final Cut Pro.
Music is licensed from AGSoundtrax.com