They can be seen for a long time, although the exact shape changes all the time.Ĭoronal 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.
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.Ĭoronal holes were first seen in images taken by astronauts on board NASA's Skylab space station in 19.
The sun has started 2015 with a mysterious event - a huge hole has appeared. It is the second time Nasa has spotted a huge hole on the sub. The bright active region on the lower right quadrant is the same region that produced solar flares last week. Magnetic fields that loop up and back down to the surface can be seen as arcs in non-coronal hole regions of the image, including over the lower right horizon. The magnetic field in these regions extends far out into space rather than quickly looping back into the sun’s surface. 'Coronal holes can be a source of fast solar wind of solar particles that envelop the Earth.' 'Coronal holes are lower density and temperature regions of the sun’s outer atmosphere, known as the corona,' explained Nasa. In the parts of the corona where the particles leave the sun, the glow is much dimmer and the coronal hole looks dark. Particles moving along those magnetic fields can leave the sun rather than being trapped near the surface. Coronal holes are regions of the corona where the magnetic field reaches out into space rather than looping back down onto the surface.
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