Reading an 2005 article by Fraser Cain called Smallest Ever Coronal Mass Ejection I became interested in the exact definition of CME. It seems like a simple question - but I did not manage to find the answer to the question myself. Is there a smallest possible coronal mass ejection (CME)? Is there a theoretical limit or is it a matter of observing capabilities?
Note: I left intentionally open whether "small" refers to mass, size, duration, or any other parameter.