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Stokes polarimeter for mid-IR solar magnetic field measurements

A motorized rotating wave plate polarization analyzer has been built for modulating solar light as input to the Celeste high-resolution cryogenic grating spectrometer to record full Stokes parameter maps at 12 microns wavelength of areas around sunspot and plage regions. The instrument system was used at the McMath-Pierce (1.5 m aperture, f/54) solar telescope at Kitt Peak, where single position slit spectra are spatially 120 arc-sec long, with a double sampled spectral resolution of 0.036 cm-1. Stepper motor driven limb guiders and synchronized action of polarization wheels are under the control of the Celeste data system computer, allowing unattended programmable scanning with 2-3 arc-sec steps for several hours. The results are spatial maps of magnetic field strength and direction, strength measured directly to the level of a few hundred gauss, with a time resolution of approx. 5 minutes per slit position. In this presentation we describe the Mid-IR Stokes polarimetry instrument system, design and performance, and discuss plans for future development.