Mysterious STEVE appears after the STRONGEST solar storm in 6 years hits Earth
On March 23, a massive and powerful cloud of coronal mass ejections struck the Earth and caused a terrifying solar storm event that no one saw coming. Due to the cracks on the magnetic fields of Earth, the particles seeped into the upper atmosphere and sparked a G4-class geomagnetic storm. The storm caused radio blackouts, GPS disruptions and aurora displays. But it also triggered a very mysterious phenomenon called STEVE or Strong Thermal Emission Velocity Enhancement. The phenomenon flashed a bright stream of light across the sky which was not like any aurora even seen.
The phenomenon was also reported by SpaceWeather.com which noted in the March 25 entry of its website, “STEVE (Strong Thermal Emission Velocity Enhancement) looks like an aurora, but it is not. The phenomenon is caused by hot (3000°C) ribbons of gas flowing through Earth's magnetosphere at speeds exceeding 6 km/s (13,000 mph). These ribbons appear during strong geomagnetic storms, revealing themselves by their soft purple glow”. The phenomenon was seen over South Dakota, Washington State, Idaho, Idaho again, Montana and Scotland.
STEVE is a very recent discovery. It was officially discovered in 2016 by citizen scientists and aurora hunters in northern Canada, according to Live Science. It was later verified by European Space Agency's (ESA) Swarm satellites. The purple glow is formed due to excessively hot (more than 3000 degrees Celsius) gas ribbons that move through the magnetosphere of the Earth. These gas ribbons typically move much faster than the air surrounding it and when it comes in contact with the radiation of solar storms, it gives out a band of glowing color. These are different from auroras because they are not caused by solar radiations
Read more on tech.hindustantimes.com
