![coronal hole on the surface of the sun on Jan. 28.](https://cdn.mos.cms.futurecdn.net/mUNHuS5gMtTABKKByDWGCA-320-80.jpg)
Gigantic 500,000-mile 'hole' in the sun's atmosphere aims aurora-sparking solar wind at Earth (photo)
The gigantic coronal hole is blasting high-speed solar wind toward Earth, potentially igniting vibrant auroras and minor geomagnetic activity on Jan. 31.