  In a frame of the $t-J-G$ model we derive the microscopical expression for
the circulating orbital currents in layered cuprates using the anomalous
correlation functions. In agreement with $\mu$-on spin relaxation ($\mu$SR),
nuclear quadrupolar resonance (NQR) and inelastic neutron scattering(INS)
experiments in YBa$_2$Cu$_3$O$_{6+x}$ we successfully explain the order of
magnitude and the monotonous increase of the {\it internal} magnetic fields
resulting from these currents upon cooling. However, the jump in the intensity
of the magnetic fields at T$_c$ reported recently seems to indicate a
non-mean-field feature in the coexistence of current and superconducting states
and the deviation of the extended charge density wave vector instability from
its commensurate value {\bf Q}$\approx(\pi,\pi$) in accordance with the
reported topology of the Fermi surface.
