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STEVE Arc All-Sky with Green Fingers (Aug 7, 2022).jpg

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A portrait of the infamous STEVE arc of hot flowing gas associated with an active aurora, here showing his distinctive pink colour and the fleeting appearance of the green picket fence fingers that often show up hanging down from the main arc. On this night the green fingers lasted no more than two minutes. STEVE = Strong Thermal Emission Velocity Enhancement, and is a river of hot gas flowing east to west equatorward of the main aurora band. STEVE appeared after the main Kp5-level aurora died down in activity to the north, typical behaviour for STEVE. He was visible for only 35 to 40 minutes, again typical.

This is a single untracked image looking straight up, and taking in most of the summer sky using a fish-eye lens. Moonlight from the setting waxing gibbous Moon lights the sky, as does the bright aurora to the north, visible at left. The Summer Triangle stars are at centre at the zenith; Jupiter is the bright object rising at lower left in the southeast.

This is a 20-second exposure with the Canon Ra at ISO 1600 and the TTArtisan 7.5mm lens at f/2. The frame is part of a time-lapse sequence.
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Aurora
A portrait of the infamous STEVE arc of hot flowing gas associated with an active aurora, here showing his distinctive pink colour and the fleeting appearance of the green picket fence fingers that often show up hanging down from the main arc. On this night the green fingers lasted no more than two minutes. STEVE = Strong Thermal Emission Velocity Enhancement, and is a river of hot gas flowing east to west equatorward of the main aurora band. STEVE appeared after the main Kp5-level aurora died down in activity to the north, typical behaviour for STEVE. He was visible for only 35 to 40 minutes, again typical. <br /> <br /> This is a single untracked image looking straight up, and taking in most of the summer sky using a fish-eye lens. Moonlight from the setting waxing gibbous Moon lights the sky, as does the bright aurora to the north, visible at left. The Summer Triangle stars are at centre at the zenith; Jupiter is the bright object rising at lower left in the southeast. <br /> <br /> This is a 20-second exposure with the Canon Ra at ISO 1600 and the TTArtisan 7.5mm lens at f/2. The frame is part of a time-lapse sequence.