  We study the combined effects of a finite volume and an external magnetic
field on the charged two-pion correlation function. For these purposes, we
consider a dilute system of pions where the finite volume effects are
introduced computing the pion wave functions with rigid boundary conditions in
a cylindrical geometry in the presence of a uniform and constant magnetic
field. We find that for slow pions, namely, for the case where the average pair
momentum is small, the correlation function shows a large distortion, as
opposed to the case where the average pair momentum is large. For a finite
density system, the intercept of the correlation function is reduced, signaling
the increasing importance of the pion ground state contribution. An increasing
strength of the magnetic field reduces the importance of the ground state and
the intercept becomes closer to 2.
