Atmospheric optical phenomenon, which appears as a light ribbon in the sky
For other uses, see Steve (disambiguation).
A photograph of a STEVE phenomenon on 17 August 2015 at Little Bow Resort, AB, CanadaAn image of STEVE taken at 12:30am in Alberta, Canada in 2018.
STEVE (Strong Thermal Emission Velocity Enhancement) is an atmospheric optical phenomenon that appears as a purple and green light ribbon in the sky, named in late 2016 by aurora watchers from Alberta, Canada. According to analysis of satellite data from the European Space Agency's Swarm mission, the phenomenon is caused by a 25 km (16 mi) wide ribbon of hot plasma at an altitude of 450 km (280 mi), with a temperature of 3,000 °C (3,270 K; 5,430 °F) and flowing at a speed of 6 km/s (3.7 mi/s) (compared to 10 m/s (33 ft/s) outside the ribbon). The phenomenon is not rare, but had not been investigated and described scientifically prior to that time.[1][2][3]
^McRae, Mike (24 April 2017). "Introducing Steve - a Newly Discovered Astronomical Phenomenon". ScienceAlert.
^"When Swarm Met Steve". ESA. 21 April 2017.
^American Geophysical Union (20 August 2018). "New kind of aurora is not an aurora at all". Physorg.com. Retrieved 2018-08-21.
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