The Advanced Stokes Polarimeter: A New Instrument for Solar Magnetic Field Research

Physics – Optics

Scientific paper

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Scientific paper

A new Stokes polarimeter for high spatial resolution quantitative measurement of magnetic fields at multiple heights in the solar atmosphere has been constructed by the National Center for Atmospheric Research and the National Solar Observatory. The instrument has become operational at the Vacuum Tower Telescope at Sunspot, New Mexico and uses its existing horizontal spectrograph, universal birefringent filter, and image motion stabilization system. To these optical systems we have added a rotating wave plate polarimeter and polarization calibration optics. Multiple CCDs are used for detection followed by video processing in order to produce polarization maps of solar regions from several spectrum lines simultaneously. Significant developments include: a) construction of the new VTT post focus optical arrangement, b) creation of a polarization model for the VTT, c) construction of high speed, low noise CCD cameras, and d) construction of computer hardware for receiving and processing high rate 12-bit digital data.

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