A meron or half-instanton is a Euclidean space-time solution of the Yang–Mills field equations.
It is a singular non-self-dual solution of topological charge 1/2.
The instanton is believed to be composed of two merons.
[1] A meron can be viewed as a tunneling event between two Gribov vacua.
[2] In that picture, the meron is an event which starts from vacuum, then a Wu–Yang monopole emerges, which then disappears again to leave the vacuum in another Gribov copy.