NASA said the flares may suggest the sun is emerging from the solar minimum and entering its next cycle.
The sun has been "blank" for over three quarters of the year, putting it in the running for one of the quietest periods since the start of the Space Age.
Some solar cycles feature lots of activity, while others can be relatively quiet.
Space weather is driven by activity from the sun.
Space weather can have significant impact here on Earth.
The storm covers an area of more than 7 million square miles.
Meet "Steve," a beautiful but mysterious arc of light.
While scientists had suspected plasma sheets were unstable, no one had ever managed to characterize that instability until now.
Space probes have found a barrier resulting from low frequency radio waves which could shield us from geomagnetic storms.