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STEVE Phenomenon

Posted on August 17, 2022 by admin1  68

In News 

  • The cosmic phenomenon known as “Strong Thermal Emission Velocity Enhancement (STEVE) made a surprise appearance after a huge solar storm hit Earth.

About STEVE Phenomenon

  • STEVE first appeared in the sky in 2017 and has been appearing often since.
    • There is evidence to support the claim that the phenomenon has been visible in the sky since 1705
  • It is a rare, mysterious, glowing purple arc that runs east to west and occurs closer to the equator. 
  • How does it occur?
    • The phenomenon is believed to be caused by a 25 km wide ribbon of hot plasma moving at a speed of 6 km/s (compared to 10 m/s outside the ribbon) at an altitude of 450 km
    • It has been observed in New Zealand, Canada, Alaska and the United Kingdom during a specific time of the year – between October to February which lead NASA scientists to believe that its occurrence is related to seasons. 

How is it different from Aurora Borealis?

  • Disturbances in the Earth’s magnetosphere due to solar wind cause Auroras.
    • These disturbances occur because of enhancements in the speed of the solar wind from coronal holes and coronal mass ejections. “
  • While the skylights, STEVE and the Auroras might seem similar, they are nothing alike. 
    • To begin with, the STEVE phenomenon is closer to the equator than the Auroras. 
    • STEVE is different from the usual aurora, but it is made of light and it is driven by the auroral system. 

Source: LM

 
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