Skip to main content
SpringerLink
Log in

On polarimetry in solar active regions

VII: A new Zeeman polarimeter and its advantages as compared to other designs

  • Published:
Solar Physics Aims and scope Submit manuscript

Abstract

A new modulation procedure for Zeeman polarimeters is described and tested. The azimuth rotation by means of two steady λ/4-plates, combined with the common EOLM, has several advantages as compared to ‘two-EOLM-polarimeters’. The new polarimeter operates with two λ/4-plates which are alternately passed through the beam in front of the EOLM by means of an electro-mechanical chopper. The exact time of the λ/4-plate change is monitored by a photoelectric sensor. The obtained signals drive a number of relays by use of an intervening bistable electronic device. These relays allow to cut-off the erroneous Doppler signal mode and they furthermore distribute the U and Q signals into the corresponding lock-in amplifiers. As a first application of the new polarimeter, the linear polarization is measured in a sunspot penumbra. The telescope was first compensated for instrumental linear polarization down to ≲ 5 × 10-4 by means of a tilted glass plate and well as for phase retardation down to ≲ 1° by means of a Bowen compensator.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

References

  • Beckers, J. M.: 1968, Solar Phys. 5, 15.

    Google Scholar 

  • Beckers, J. M.: 1969, Solar Phys. 9, 372.

    Google Scholar 

  • Beckers, J. M.: 1971, in R. Howard (ed.), ‘Solar Magnetic Fields’, IAU Symp. 43, 3.

  • Brückner, G.: 1968, Z. Astrophys. 86, 48.

    Google Scholar 

  • Kjeldseth-Moe, O. and Maltby, P.: 1969, Solar Phys. 8, 273.

    Google Scholar 

  • Livingston, W. and Harvey, J.: 1971, Publ. Kitt Peak Obs. 558.

  • Stellmacher, G. and Wiehr, E.: 1970, Astron. Astrophys. 7, 432.

    Google Scholar 

  • Stellmacher, G. and Wiehr, E.: 1972, Astron. Astrophys. 19, 293.

    Google Scholar 

  • Stellmacher, G. and Wiehr, E.: 1973, Astron. Astrophys. 29, 13.

    Google Scholar 

  • Unno, W.: 1956, Publ. Astron. Soc. Japan 8, 108.

    Google Scholar 

  • Wiehr, E.: 1969, Solar Phys. 9, 225 (Paper I).

    Google Scholar 

  • Wiehr, E.: 1970, Solar Phys. 11, 399 (Paper II).

    Google Scholar 

  • Wiehr, E.: 1971, Solar Phys. 18, 226 (Paper IV).

    Google Scholar 

  • Wiehr, E. and Rossbach, M.: 1974, Solar Phys. 35, 343 (Paper VI).

    Google Scholar 

Download references

Author information

Authors and Affiliations

  1. Universitäts-Sternwarte, D-34, Göttingen, F.R.G.

    E. Wiehr

Authors
  1. E. Wiehr
    View author publications

    You can also search for this author in PubMed Google Scholar

Rights and permissions

Reprints and permissions

About this article

Cite this article

Wiehr, E. On polarimetry in solar active regions. Sol Phys 35, 351–359 (1974). https://doi.org/10.1007/BF00151957

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF00151957

Keywords

Search

Navigation