"Steve" is a strip of ionized gas moving through the air at about four miles per second, with temperatures as high as 10,800 degrees Fahrenheit — as hot as the earth’s core.
http://www.techtimes.com/articles/205730/20170424/meet-steve-scientists-aurora-enthusiasts-find-new-mysterious-light-in-the-night-sky.htm
http://mobile.abc.net.au/news/2017-04-24/new-light-phenomenon-called-steve-by-aurora-watchers/8466234?pfmredir=sm
