An ultraviolet polarimeter for the Solar Maximum Mission

Computer Science

Scientific paper

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High Resolution, Polarimeters, Satellite-Borne Instruments, Solar Maximum Mission, Ultraviolet Spectrometers, Calibrating, Gratings (Spectra), Lyman Alpha Radiation, Magnesium Fluorides, Oso-8, Solar Instruments

Scientific paper

The Solar Maximum Mission experiment contingency will include one instrument originally designed and built for OSO-8. The engineering model of the OSO-8 High Resolution Spectrometer has been rebuilt to make it lightworthy and to encompass several new functions, including solar ultraviolet polarimetry. The rebuilt package is designated as the High Resolution Ultraviolet Spectrometer/Polarimeter. The device that enables polarimetry is a dual channel rotating waveplate system. The waveplates are magnesium fluoride and will allow measurements to be made ranging from the Lyman alpha line to near visible ultraviolet. One wavelength channel will use the polarization characteristics of the spectrometer diffraction grating as the analyzer. The second channel has a built-in four-mirror polarizer. This paper describes the polarimeter design, operation, and calibration.

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