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A schematic illustration of the complete MOF instrument for photospheric observations. Collimated sunlight passes through a two-stage filtering process. The filter section consists of an atomic vapour subject to an axial magnetic field placed between crossed polarisers. The temperature of the vapour and the strength of the magnetic field are chosen to achieve a suitable narrow transmission profile – with two wings – centred on the atomic resonance. The second vapour cell and quarter waveplate are used to encode the transmission of the opposite handedness of circularly polarised light into vertical and horizontally polarised light, which is subsequently imaged by cameras CMOS1 and 2, respectively.
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