Enhanced absorption Hanle effect on the F-g = F -> F-e = F+1 closed transitions

We analyse the Hanle effect on a closed F-g --> F-e = F-g + 1 transition. T wo configurations are examined, for linearly and circularly polarized laser radiation, with the applied magnetic field collinear to the laser light wa vevector. We describe the peculiarities of the Hanle signal for linearly po larized laser excitation, characterized by narrow bright resonances at low laser intensities. The mechanism behind this effect is identified, and nume rical solutions for the optical Bloch equations are presented for different transitions.