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The shimmering green, red and purple curtains of the northern and southern lights—the auroras—may be the best-known phenomena lighting up the nighttime sky, but the most mysterious are the mauve and white streaks called Steve and their frequent companion, a glowing green "picket fence."
The Mysterious Green Streaks Below STEVE - Semeter - 2020 - AGU
Frontiers Unsolved problems in Strong Thermal Emission Velocity
NASA, citizen scientists study the mystery of Steve
Auroras, Spaceweather.com
Sub‐Auroral Green STEVE Arcs – Evidence for Low Energy Excitation
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Has anyone ever experienced something bad from the northern lights
Time Machine
steve: UFO or phenomenon? Here's what purple and green lights