  We give an analytical solution representing circular magnetic monopole loops
joining a pair of merons in the four-dimensional Euclidean SU(2) Yang-Mills
theory. This is achieved by solving the differential equation for the adjoint
color (magnetic monopole) field in the two--meron background field within the
recently developed reformulation of the Yang-Mills theory. Our analytical
solution corresponds to the numerical solution found by Montero and Negele on a
lattice. This result strongly suggests that a meron pair is the most relevant
quark confiner in the original Yang-Mills theory, as Callan, Dashen and Gross
suggested long ago.
