Large coronal hole in Sun’s surface unexplained

Scientists at NASA have discovered a huge coronal hole at the south pole of the Sun, a mysterious phenomenon that gave rise to appearance of dark spots on the solar surface, according to an article published by the American space agency.

The causes of such coronal holes are yet unknown, but researchers believe that such phenomena are triggered by dispersion of particles that travel at high speeds of over 800 km/h across the surface of the Sun.

Solar Disk with Coronal Hole spotted by NASA STEREO Observatory (public domain)

The shiny color of the sun is given by the condensed particles at its surface. The coronal holes feature far less such particles and these areas are darker and colder.
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When they occur, the coronal holes may remain in the Sun for up to 5 years and during this time they may change their shape and size.

Furthermore, NASA say that coronal holes can have a direct impact on the Earth. The dispersion of particles in these regions can set off the northern lights (aurora borealis) or southern lights (aurora australis) on Earth but also geomagnetic storms.

The coronal hole recently discovered is much larger than those seen so far, a fact surprising the scientists and reminding us of our limited knowledge about the cosmic bodies in our neighborhood.