These dark spots on the Sun, visible in ultraviolet light, are called coronal holes and are areas where fast solar wind bursts out into space. By chance, they managed to take a photo that looked like the sun was smiling.
On October 26, NASA's Solar Dynamic Observatory (SDO) photographed the Sun "smiling". These dark spots on the Sun, visible in UV light, are called coronal holes and are areas where the fast solar wind bursts out into space.
SDO has studied how the Sun creates solar activity and causes space weather since its launch in 2010. His observations begin at the sun's interior with the solar dynamo—the stirring of the sun's interior that creates its magnetic field and causes space weather. Later, SOD also observes the Sun's face to directly measure the Sun's magnetic field and atmosphere. Finally, SDO measures the Sun's extreme UV radiation which is an important factor in the structure and composition of the Earth's upper atmosphere.
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