Abstract
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.
The Solar Dynamics Observatory
Guest Editors: W. Dean Pesnell, Phillip C. Chamberlin, and Barbara J. Thompson.
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Beck, C., Schlichenmaier, R., Collados, M., Bellot Rubio, L., Kentischer, T.: 2005, A polarization model for the German vacuum tower telescope from in situ and laboratory measurements. Astron. Astrophys. 443, 1047 – 1053. doi:10.1051/0004-6361:20052935.
Beck, C., Schmidt, W., Kentischer, T., Elmore, D.: 2005, Polarimetric littrow spectrograph – instrument calibration and first measurements. Astron. Astrophys. 437, 1159 – 1167. doi:10.1051/0004-6361:20052662.
Borrero, J.M., Tomczyk, S., Norton, A., Darnell, T., Schou, J., Scherrer, P., Bush, R., Liu, Y.: 2007, Magnetic field vector retrieval with the helioseismic and magnetic imager. Solar Phys. 240, 177 – 196. doi:10.1007/s11207-006-0219-x.
Collados, M.V.: 2003, Stokes polarimeters in the near-infrared. In: S. Fineschi (ed.) SPIE Conference Series, 4843, 55 – 65. doi:10.1117/12.459370.
Etzel, S.M., Rose, A.H., Wang, C.M.: 2000, Dispersion of the temperature dependence of the retardance in SiO2 and MgF2. Appl. Opt. 39, 5796 – 5800. doi:10.1364/AO.39.005796.
Ichimoto, K., Lites, B., Elmore, D., Suematsu, Y., Tsuneta, S., Katsukawa, Y., Shimizu, T., Shine, R., Tarbell, T., Title, A., Kiyohara, J., Shinoda, K., Card, G., Lecinski, A., Streander, K., Nakagiri, M., Miyashita, M., Noguchi, M., Hoffmann, C., Cruz, T.: 2008, Polarization calibration of the solar optical telescope onboard Hinode. Solar Phys. 249, 233 – 261. doi:10.1007/s11207-008-9169-9.
Kuhn, J.R., Balasubramaniam, K.S., Kopp, G., Penn, M.J., Dombard, A.J., Lin, H.: 1994, Removing instrumental polarization from infrared solar polarimetric observations. Solar Phys. 153, 143 – 155. doi:10.1007/BF00712497.
Norton, A.A., Graham, J.P., Ulrich, R.K., Schou, J., Tomczyk, S., Liu, Y., Lites, B.W., López Ariste, A., Bush, R.I., Socas-Navarro, H., Scherrer, P.H.: 2006, Spectral line selection for HMI: a comparison of Fe I 6173 Å and Ni I 6768 Å. Solar Phys. 239, 69 – 91. doi:10.1007/s11207-006-0279-y.
Schou, J., Scherrer, P.H., Bush, R.I., Wachter, R., Couvidat, S., Rabello-Soares, M.C., et al.: 2010, The helioseismic and magnetic imager instrument design and calibration. Solar Phys., in press.
Selbing, J.: 2005, SST polarization model and polarimeter calibration. Master’s thesis, Stockholm University, Stockholm, Sweden.
Skumanich, A., Lites, B.W., Martinez Pillet, V., Seagraves, P.: 1997, The calibration of the advanced stokes polarimeter. Astrophys. J. Suppl. 110, 357. doi:10.1086/313004.
Wachter, R., Schou, J., Rabello-Soares, M.C., Miles, J.W., Duvall, T.L. Jr., Bush, R.I.: 2010, Image quality of the helioseismic and magnetic imager. Solar Phys., in press.
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Schou, J., Borrero, J.M., Norton, A.A., Tomczyk, S., Elmore, D., Card, G.L. (2010). Polarization Calibration of the Helioseismic and Magnetic Imager (HMI) onboard the Solar Dynamics Observatory (SDO). In: Chamberlin, P., Pesnell, W.D., Thompson, B. (eds) The Solar Dynamics Observatory. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-3673-7_14
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DOI: https://doi.org/10.1007/978-1-4614-3673-7_14
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