Stokes II - A new polarimeter for solar observations

Details Stokes II - A new polarimeter for solar observations Stokes II - A new polarimeter for solar observations

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981soph...70..395b&link_type=abstract

Solar Physics, vol. 70, Apr. 1981, p. 395-410.

Physics

30

Magnetic Measurement, Polarimeters, Solar Instruments, Solar Magnetic Field, Coronagraphs, Infrared Detectors, Modems, Photodiodes, Signal To Noise Ratios, Solar Arrays, Solar Prominences

Scientific paper

The Stokes II polarimeter of the High Altitude Observatory has been designed for measuring vector magnetic fields both on the solar disk and above the limb in prominences. The use of this instrument on a coronagraph permits operation with very low scattered light and very low instrumental polarization. Array detectors on the instrument provide a speed increase of 50 times over an earlier single sensor version of the instrument (Stokes I) and extend the range of usable wavelengths from the visible spectrum to 10,950 A in the infrared. The extensive polarization calibration system of Stokes I has been improved by the addition of a polarization scrambler, which provides an unpolarized reference to reduce errors from time drifts in the calibration to less than 0.00001 on the polarization measurements.

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