Solar Physics

, Volume 164, Issue 1–2, pp 243–252 | Cite as

Recent progress in imaging polarimetry

  • C. U. Keller


Recent instrumental developments in imaging polarimetry allow array detectors to reach a polarimetric sensitivity of 1 × 10−4 of the intensity. New instrumental effects appear at these levels of sensitivity and generate spurious polarization signals with amplitudes of up to 5 × 10−4. Here I discuss these effects and present methods to avoid them. Polarized spectra with an rms noise of 6 × 10−6 may then be obtained. Furthermore a method is brought to the reader's attention that allows polarization measurements at the 1 × 10−4 level with regular array detectors, e.g. in the near-infrared.

Key words

Polarimetry Spectroscopy Array detectors 


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  1. Donati, J.-F., Semel, M., Rees, D.E., Taylor, K., Robinson, R.D.: 1990, A&A 232, L1Google Scholar
  2. Keller, C.U., Aebersold, F., Egger, U., Povel, H.P., Steiner, P., Stenflo, J.O.: 1992, LEST Technical Report 53 Google Scholar
  3. Kuhn, J.R.: 1995, in Kuhn, J.R., Penn, M. (eds.), IR Tools for Solar Astrophysics, World Scientific, Singapore, in pressGoogle Scholar
  4. Oakberg, T.C.: 1995, Opt. Eng. 34, 1545Google Scholar
  5. Povel, H.P.: 1995, Opt. Eng. 34, 1870Google Scholar
  6. Povel, H.P., Keller, C.U., Yadigaroglu, I.-A.: 1994, Applied Optics 33, 4254Google Scholar
  7. Rabin, D.M., Jaksha, D., Plymate, C., Wagner, J., Iwata, K.: 1991, in November, L.J. (ed.), Proc. of the 11th Sacramento Peak Summer Workshop on Solar Polarimetry, Sunspot, New Mexico, 361Google Scholar
  8. Rüedi, I., Keller, C.U., Solanki, S.K.: 1996, these proceedingsGoogle Scholar
  9. Semel, M., Donati, J.-F., Rees D.E.: 1993, A&A 278, 231Google Scholar
  10. Stenflo, J.O.: 1996, these proceedingsGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1996

Authors and Affiliations

  • C. U. Keller
    • 1
  1. 1.National Solar ObservatoryTucsonUSA

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