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On polarimetry in solar active regions

VI: Experimental compensation of telescopic phase retardation; influences on Zeeman polarimetry

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Abstract

Phase retardation caused by the Grégory-Coudé telescope at Locarno is determined empirically and compared with calculations. Good agreement is found for a proper retardation angle Δ = 16° for each of the two plane mirrors in the telescope.

The praxis of compensation by means of two λ/8-plates (Bowen compensator) is described and tested. It is found that the phase retardation τ can be compensated down to the limits of detectability (τ ≲ 1°).

It is known that the same quality of compensation can easily be achieved on the telescopic linear polarization by means of a tilted glass plate. Hence, among telescopes fitting to fixed spectrographs, those are most suited for solar Zeeman polarimetry where the beam passes along the α- and δ-axes, since telescopic effects depend only on δ and can for the entire day rather simply be compensated.

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Authors and Affiliations

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

    E. Wiehr & M. Rossbach

Authors
  1. E. Wiehr
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  2. M. Rossbach
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Wiehr, E., Rossbach, M. On polarimetry in solar active regions. Sol Phys 35, 343–349 (1974). https://doi.org/10.1007/BF00151956

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  • DOI: https://doi.org/10.1007/BF00151956

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