The European Space Agency/NASA Solar and Heliospheric Observatory, or SOHO, captured this image of a gigantic coronal hole hovering over the sun's north pole on July 18, 2013, at 9:06 a.m. EDT.
Coronal holes are dark, cold areas in the sun's outermost atmospheric layer.
They contain little solar material, have lower temperatures, and therefore, appear much darker than their surroundings.
They are the sources of solar winds -- streams of charged particles that travel at more than 1 million mph and can cause auroras and geomagnetic storms (worldwide disturbances of the Earth's magnetic field) when they reach the Earth.
Coronal holes are a typical feature on the sun, though they appear at different places and with more frequency at different times of the sun's activity cycle. The activity cycle is currently ramping up toward what is known as solar maximum, currently predicted for late 2013. During this portion of the cycle, the number of coronal holes decreases. During solar max, the magnetic fields on the sun reverse and new coronal holes appear near the poles with the opposite magnetic alignment. The coronal holes then increase in size and number, extending further from the poles as the sun moves toward solar minimum again. Continue reading at: http://www.messagetoeagle.com/gigantichole18july.php?utm_source=fee... |
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