NASA's Solar Dynamics Observatory recorded the extreme ultraviolet flash.
Onizing radiation from the flare could cause HF radio blackouts and other communications disturbances, especially on the day-lit side of Earth.
In the next few hours, when coronagraph data from SOHO and STEREO become available, we will see if a CME emerges from the blast site. If so, the cloud would likely be aimed directly at Earth and could reach our planet in 2 to 3 days.
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