Experimental and theoretical Physics with the Cacciani Filter

The Magneto-Optical Filter (MOF) is a narrow passband filter using the polirized light interacting with metal vapours in a magnetic field. It is also called Cacciani Filter and mainly used in solar observations, allowing to acquire high sensitivity velocity and magnetic images of the Sun with small instrumentation. Models for functioning of the filter and for calibration of results require theories for anysotropic light-matter interaction in presence of magnetic fields and imaging reconstruction. Data calibration and interpretation have been provided, paving the way for new clues on sources of solar oscillations.

A. Cacciani, P.F.  Moretti, W.E. Rodgers, 1997, "Measuring Doppler and Magnetic fields simultaneously", Solar Phys., 174, 115

A. Cacciani, P.F.  Moretti, 1997, "Magnetic contamination and correction in Sodium Dopplergrams", Solar Phys., 175, 1

P.F.  Moretti, 2000, "Dopplergrams calibration", Solar Phys., 196, 51

P.F.  Moretti, 2000, "Can dopplergrams be corrected for straylight?", Solar Phys., 196, 299

P.F.  Moretti, G. Severino, 2002, "The I-V phase difference with Magneto-Optical Filters", Astron. & Astroph., 384, 638

P.F.  Moretti, G. Severino, 2004, "A model to interpret the I-V and V-V phase differences from solar observations obtained with magneto-optical filters”, Astron. & Astroph., 421, 729