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Spectroscopic investigation of a birefringent Lyot-filter for Hα

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Abstract

The instrumental profile of a Lyot-filter with 0.5 Å pass-band for Hα has been determined from photographic spectra obtained with a large grating spectrograph and a continuous light source.

After fine adjustment of the filter, the transmission profile in parallel light agrees closely with the theoretical profile as given by crystal optics. The peak transmission has been found to be 12% of the incident unpolarized radiation.

Convolving the measured instrumental profile with the average solar spectral distribution near Hα, it can be shown that the parasitic light (transmission outside the main pass-band) contributes 10% to the total light flux with the filter centered on the line. At wavelength shifts of 0.5 and 0.8Å, the parasitic light contribution is 25% and 40%, respectively.

The deformation of the line-profile of various solar phenomena (faculae, filaments, flares) by the instrumental profile is discussed quantitatively.

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Authors and Affiliations

  1. Fraunhofer Institut, Freiburg i. Br.

    Marina Krafft

Authors
  1. Marina Krafft
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Mitteilungen aus dem Fraunhofer Institut Nr. 82.

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Krafft, M. Spectroscopic investigation of a birefringent Lyot-filter for Hα. Sol Phys 5, 462–470 (1968). https://doi.org/10.1007/BF00147013

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  • DOI: https://doi.org/10.1007/BF00147013

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