It's coming this way: The CME, seen by Nasa's STEREO-B spacecraft, can be seen blasting out from the Sun on the right-hand side (circled)
On the downside, experts expect radio blackouts for a few days, caused by the radiation from the flare - or coronal mass ejection (CME) - causing magnetic storms.
The flare is part of a larger increase in activity in the Sun, which runs in 11-year cycles. It is expected to peak around 2013.
The National Oceanic and Atmospheric Administration's Space Weather Prediction Center wrote: 'Category G1 (Minor) geomagnetic storms are expected 28 and 29 December due to multiple coronal mass ejection arrivals. R1 (Minor) radio blackouts are expected until 31 December.'
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