What is STEVE phenomenon? How it occurs ?
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Steve is an atmospheric optical phenomenon which appears as a purple and green light ribbon in the sky, formally discovered in 2017 by aurora watchers from Alberta, Canada . According to Eric Donovan's analysis of satellite data from the European Space Agency (ESA)'s Swarm mission, Steve is caused by a 25 km wide ribbon of hot gases at an altitude of 450 km (280 miles), wih a temperature of 3000 °C and flowing at a speed of 6 km/s
(compared to 10 m/s outside the ribbon). The phenomenon is not rare, but nobody had looked into it in detail prior to that.
Occurrence and cause
Steve can be spotted closer to the Equator than theaurora, and as of March 2018 has been observed in the United Kingdom, Canada, Alaska, northern U.S. states and
New Zealand. Steve appears as a very narrow arc extending for hundreds or thousands of miles, aligned east-west.
Steve generally lasts for 20 minutes to an hour. As of March 2018, Steve has only been spotted in the presence of an aurora. Steve was not observed from October 2016 to February 2017, or from October 2017 to February 2018,
leading NASA to believe that Steve may only appear in certain seasons.
(compared to 10 m/s outside the ribbon). The phenomenon is not rare, but nobody had looked into it in detail prior to that.
Occurrence and cause
Steve can be spotted closer to the Equator than theaurora, and as of March 2018 has been observed in the United Kingdom, Canada, Alaska, northern U.S. states and
New Zealand. Steve appears as a very narrow arc extending for hundreds or thousands of miles, aligned east-west.
Steve generally lasts for 20 minutes to an hour. As of March 2018, Steve has only been spotted in the presence of an aurora. Steve was not observed from October 2016 to February 2017, or from October 2017 to February 2018,
leading NASA to believe that Steve may only appear in certain seasons.
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