THE IMAGING VECTOR MAGNETOGRAPH AT HALEAKALA III. Effects of Instrumental Scattered Light on Stokes Spectra

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The scattering of light over the field of view of a solar spectropolarimeter affects all Stokes parameters. The magnetic field vector inferred from the Stokes spectra then has systematic error. The reason is that scattering affects polarized radiation as well as unpolarized. Accurate correction of the Stokes spectra from the Imaging Vector Magnetograph (IVM) of the Mees Solar Observatory illustrates the problem and the solutions.

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