[wastedyears]

From Wikipedia: A solar flare on January 20, 2005 released the highest concentration of protons ever directly measured,[3] taking only 15 minutes after observation to reach Earth, indicating a velocity of approximately one-half light speed.

[HiTech RedNeck]

Holy relativistic velocities, Batman!

I’d quibble that it was more like 1/3 the speed of light, because it took 8 minutes to be seen as happening on the sun’s surface, then another 15 minutes to get here. So after that first 8 minutes it was about a third of the way here.