The Return of STEVE

Posted: September 6, 2019 by oldbrew in Electro-magnetism, solar system dynamics

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Introducing ‘STEVE and the green pickets’. This summer, researchers confirmed that STEVE is not an aurora, but is instead a unique phenomenon.

Spaceweather.com

Sept. 5, 2019: Sky watchers are still sorting out all the things they saw during last weekend’s Labor Day geomagnetic storm.  Upon further review, not every light in the sky was the aurora borealis. There was also STEVE:

“Look at the mauve-colored plume. That’s STEVE,” says Alan Dyer, who took the picture at the Saskatchewan Summer Star Party on Aug. 31st. “We saw STEVE two nights in a row from our area in western Canada.”

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 some geomagnetic storms, revealing themselves by their soft purple glow.

Earlier this year, researchers led by Toshi Nishimura of Boston University published an important paper about STEVE. Using data from NASA’s THEMIS spacecraft, they…

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Comments
  1. Chaeremon says:

    Must watch also here, The Lightning Scarred Planet, Mars,

  2. oldbrew says:

    Aspen Beach Lakeview Campground. August 31, 2019 from 12:00am to 12:45am. I was trying to capture the northern lights in the horizon when STEVE came out of nowhere. It was shooting out with green and purple colour. It was dancing and moving like a midnight colourful tornado.


    [23 secs.]

  3. oldbrew says:

    Below: Artist’s rendition of the magnetosphere during the STEVE occurrence, depicting the plasma region which falls into the auroral zone (green), the plasmasphere (blue) and the boundary between them called the plasmapause (red). The THEMIS and SWARM satellites (left and top) observed waves (red squiggles) that power the STEVE atmospheric glow and picket fence (inset), while the DMSP satellite (bottom) detected electron precipitation and a conjugate glowing arc in the southern hemisphere.
    Credit: Emmanuel Masongsong, UCLA, and Yukitoshi Nishimura, BU/UCLA

    Source: https://eos.org/scientific-press/scientists-discover-what-powers-celestial-phenomenon-steve

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