What speed characterizes the fast solar wind, and what feature does it originate from?

Answer

About $750 \text{ km/s}$ streaming from coronal holes

The fast solar wind streams away at speeds averaging about $750 \text{ km/s}$ and originates specifically from coronal holes where magnetic field lines extend outward unimpeded.

What speed characterizes the fast solar wind, and what feature does it originate from?
sunsolar windparticle