Researchers classify solar flares using three categories: C for weak, M for Moderate and X for strong. The largest flare on record, one of two known X20s, occurred on April 2, 2001, but was not directed at Earth. The following is a X17 burst from the sun and is headed straight for us. The solar flares from last week are considered X1 and X5 on the same scale.
October 28, 2003 at 6:20 pm | blabbing.