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About 15,000 years ago, the Ancient science vessel named Adaris was hit by a blast of radiation from a coronal mass ejection (CME) from Lantea's sun in Pegasus. The entire crew was killed except for the pilot, who opened a hyperspace window just as the ship was hit. He flew back to Lantea, just slightly ahead of the radiation wave, and arrived in time to warn everyone in the city. The Ancients raised the city's shield and extended it far enough to protect a large portion of the planet from the blast. (SGA: "Echoes")
The Ancients recorded such CMEs in their database and found that the sun went through an unusually turbulent sunspot cycle every fifteen thousand years. There were only two entries for these CMEs in the Atlantis database that was accessed in modern times, which might indicate that these events were part of a new phase of their sun's life since the Ancients had been there for 5-10 million years and would have recorded more events if there had been any. (SGA: "Rising", "Echoes")
No details are available about what happened when the CME occurred 30,000 years ago, other than there might still be evidence of mass extinction on the parts of the planet that weren't protected by Atlantis' shield. When the CME occurred in 2006, Lantea was protected when the Daedalus was used to disperse the flare in close proximity to the sun. (SGA: "Echoes")