On May 26, 2016 NASA, via the Solar Dynamics Observatory (SDO), announced the observance of a massive coronal hole at the suns surface, visible between May 17-19.
SDO captures a coronal hole showing up as the dark region near the top of the sun. The hole appears dark because it contains much less solar material and is therefore cooler than the surrounding area.
A gigantic hole in the sun’s atmosphere has opened up and a broad stream of solar wind is flowing out of it. Inside the coronal hole, solar wind plasma is free to fly away.