Physics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012soph..275..327s&link_type=abstract
Solar Physics, Volume 275, Issue 1-2, pp. 327-355
Physics
12
Instrumentation And Data Management, Magnetic Fields, Photosphere, Solar Dynamics Observatory
Scientific paper
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.
Borrero Juan Manuel
Card Gregory L.
Elmore David
Norton Andrew
Schou Jepser
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