yesterday there was a x6 class flare on the sun, when it happened it was on the other side of the sun so we avoided most of the radiation. This was a picture today posted today when it came into view. An X class flare is pretty significant, enough to move the space station astronauts to the other side of the space station til the proton event passes which is the predecessor to the actual flare hitting the earth. An x class flare is strong enough to cause damage to satellites, and will blank out radio signals for a period around the earth.
This picture shows a coronal hole which caused the flare.
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