The San Fernando Observatory video Stokes polarimeter

Details The San Fernando Observatory video Stokes polarimeter The San Fernando Observatory video Stokes polarimeter

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985svmf.nasa..202r&link_type=abstract

In NASA. Marshall Space Flight Center Meas. of Solar Vector Magnetic Fields p 202-218 (SEE N85-29869 18-92)

Physics

Optics

3

Magnetic Signatures, Polarimetry, Polarization (Waves), Solar Magnetic Field, Spectroheliographs, Stellar Spectrophotometry, Sun, Telescopes, Television Cameras, Design Analysis, Irradiance, Vacuum

Scientific paper

A study was conducted to determine the suitability of the San Fernando Observatory's 61 cm (24 inch) aperture vacuum solar telescope and 3 m (118 inch) focal length vacuum spectroheliograph for Stokes Polarimetry measurements. The polarization characteristics of these two instruments was measured by determining their Mueller matrices as a function of telescope orientation, field angle, wavelength, grating type, and position of the measuring beam in the telescope entrance window. In general, the polarizing and depolarizing properties are small so that inversion of the system Mueller matrix will permit the accurate measurement of Stokes profiles for vector magnetic field determination. A proposed polarimeter design based on the use of a TV camera system to simultaneously scan six different polarization components of a given line profile is described. This design, which uses no rotating optics or electronic modulators and makes efficient use of the available irradiance, promises to yield high quality vector magnetograms.

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