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A universe of beauty, mystery and wonder
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Showing posts with label Astrophysics - The Sun. Show all posts
Showing posts with label Astrophysics - The Sun. Show all posts

Saturday, January 3, 2015

WINDS OF 500 MILES PER SECOND AT NEWLY DISCOVERED HOLE IN THE SUN

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  • Coronal holes are regions of the sun's corona where the magnetic field reaches out into space
  • Particles moving along those magnetic fields can leave the sun rather than being trapped near the surface
  • Polar coronal hole can remain visible for five years or longer, although constantly changes shape 
  • Coronal holes are regions of the corona where the magnetic field reaches out into space rather than looping back down onto the surface - and eject solar winds far faster than other parts of the sun.
    Sun's coronal hole

    There were no fireworks on the sun to welcome in the New Year - and in fact, scientists say the end of the year was relatively quiet on the solar surface.
     
    However, the sun has started 2015 with a mysterious event - a huge hole has appeared.
     
    Known as a coronal hole, the phenomenon occurred near the south pole - and is seen as a dark area covered all of its base in these stunning images.
     
    The incredible image was  captured on Jan. 1, 2015 by the Atmospheric Imaging Assembly (AIA) instrument on NASA's Solar Dynamics Observatory, shows the coronal hole as a dark region in the south.
     
    Coronal holes are regions of the corona where the magnetic field reaches out into space rather than looping back down onto the surface. 
     
    Particles moving along those magnetic fields can leave the sun rather than being trapped near the surface. Those trapped particles can heat up and glow, giving us the lovely AIA images. 
     
    In the parts of the corona where the particles leave the sun, the glow is much dimmer and the coronal hole looks dark.