What is the lower limit of a coronal mass ejection? Reading an 2005 article by Fraser Cain called Smallest Ever Coronal Mass Ejection
 I became interesting 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 &quot;small&quot; refers to mass, size, duration, or any other parameter.
The above mentioned article claims that the CME in the square in the following picture is actually the smallest CME:

Related

Solar Orbiter images first coronal mass ejections, Press release of the Max Planck Institute for Solar System Research, dated May 17, 2021
Wilson effect: How &quot;deep&quot; are sunspots?
No, as ‘coronal mass ejection’ is defined ambiguously and refers to an event that is not physically bound to some exact limit and therefore cannot have an undisputable lowest limit value, in the mathematical sense, in any parameter.
For example, the Oxford dictionary states:
“
coronal mass ejection
Noun - Astronomy
An event in which a large cloud of energetic and highly magnetized plasma erupts from the solar corona into space, causing radio and magnetic disturbances on the earth.
“
Clearly, any limit, if fixed to some exact value of mass, flux, duration, etc., would have to be fixed arbitrarily.
As a thought exercise, consider if someone came along and presented you such a ‘lower limit’.
You, or a third party, can respond with: “well what about the situation where an event occurs just one electron (or one Planck second, etc.) below such a limit? Would that be considered a CME or not?”