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Coronal Holes

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    Science & Technology
  • Published
    3rd Nov, 2022


Recently, NASA Solar Dynamics Observatory captured dark patches on the sun’s surface resembling eyes and a smile.

  • NASA explained that the patches are called coronal holes.

About Coronal Hole

  • Coronal hole can be understood as a patch of the Sun’s atmosphere with much lower density than elsewhere. 
  • In ultraviolet views of the Sun, coronal holes appear as dark splotches.
  • These are regions where the Sun’s magnetic field lines are connected directly to interplanetary space, allowing solar material to escape out in a high-speed stream of solar wind, leaving a dark “hole” near the surface of the Sun. 
  • Coronal holes appear throughout the solar cycle, but can last for much longer periods of time during solar minimums, when the Sun is less active.  


  • These ‘coronal holes’ are important to understanding the space environment around the earth through which our technology and astronauts travel.

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