Johnny Borborigmi schreef:

Google CME or Coronal Mass Ejection and learn all about it.

A coronal hole is something different from a CME. A CME is a solar
flare, giant burst from the sun whike a coronal hole is a relatively
cooler area of the sun (they appear dark in EIT images) that also have a
higher release of particles then other area's from the sun.

A CME generally has more impact on earth (if it was earth bound) then a
CH, as more matter is released.

Things are a bit oversimplified, but HTH

--
JeroenK