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"Today the Solar Dynamics Observatory caught the sun 'smiling'"

Nasa has shared a satellite image of the sun on Twitter, which is inspiring the network.

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"Today the Solar Dynamics Observatory caught the sun 'smiling'"

Nasa has shared a satellite image of the sun on Twitter, which is inspiring the network. Dark spots seem to form a face that makes the sun smile. "Say Cheese!" the space agency headlined, adding, "Today the Solar Dynamics Observatory caught the sun 'smiling.'"

The dark spots on the sun are so-called coronal holes. These are only visible in ultraviolet light and mark regions where faster solar wind leaves the celestial body. Radiation and charged particles emitted from the sun into space is called the solar wind. So the coronal holes could be signs of an upcoming geomagnetic solar storm.

The images show that the sun is currently in a state of increased activity. Geomagnetic storms can have a variety of impacts. The best known is probably the appearance of the northern lights. However, in electrical power grids, the triggered geomagnetically induced currents can cause immediate damage to power transformers.

The Solar Dynamics Observatory was founded in 2010 and aims to find out how solar activity occurs and what effects it has.

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