A model to interpret the I-V and V-V phase differences from solar observations obtained with magneto-optical filters

The intensity (I) and velocity (V) signals obtained using magneto-optical filters (MOF), are not independent of each other. The induced spurious signals affect the intensity-velocity phase difference measurements and the effect is referred to as a I - V crosstalk (Moretti & Severino 2002). We show a new model to interpret the I - V phase measurements and, in particular, its application to the interpretation of the data obtained with sodium MOF systems. The model can also be applied to correct the velocity-velocity phase from multi layer observations.