  We report the evaluation of the second order Zeeman shift in the continuous
atomic fountain clock FoCS-2. Because of the continuous operation and of its
geometrical constraints, the methods used in pulsed fountains are not
applicable. We use here time-resolved Zeeman spectroscopy to probe the magnetic
field profile in the clock. The pulses of ac magnetic excitation allow us to
spatially resolve the Zeeman frequency and to evaluate the Zeeman shift with a
relative uncertainty smaller than 10E-16.
