4.3 Article

Polarization Calibration of the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO)

Journal

SOLAR PHYSICS
Volume 275, Issue 1-2, Pages 327-355

Publisher

SPRINGER
DOI: 10.1007/s11207-010-9639-8

Keywords

Instrumentation and data management; Magnetic fields, photosphere; Solar Dynamics Observatory

Funding

  1. NASA [NAS5-02139]
  2. National Science Foundation

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As part of the overall ground-based calibration of the Helioseismic and Magnetic Imager (HMI) instrument an extensive set of polarimetric calibrations were performed. This paper describes the polarimetric design of the instrument, the test setup, the polarimetric model, the tests performed, and some results. It is demonstrated that HMI achieves an accuracy of 1% or better on the crosstalks between Q, U, and V and that our model can reproduce the intensities in our calibration sequences to about 0.4%. The amount of depolarization is negligible when the instrument is operated as intended which, combined with the flexibility of the polarimeter design, means that the polarimetric efficiency is excellent.

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