Measurement of solar disc polarization in a number of Fraunhofer lines and their adjacent continuum. III - Comparison with independent measurements and with calculations

Details Measurement of solar disc polarization in a number of Fraunhofer lines and their adjacent continuum. III - Comparison with independent measurements and with calculations Measurement of solar disc polarization in a number of Fraunhofer lines and their adjacent continuum. III - Comparison with independent measurements and with calculations

Feb 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....95...54w&link_type=abstract

Astronomy and Astrophysics, vol. 95, no. 1, Feb. 1981, p. 54-58.

Physics

8

Fraunhofer Lines, Polarization (Waves), Resonance Lines, Solar Radiation, Polarimetry, Solar Limb, Solar Physics, Solar Spectra, Spectral Resolution, Sun

Scientific paper

High-sensitivity measurements of resonance line polarization in the Sr(+) 4078, Sr 4607, Ba(+) 4554, Na D2, Mg b, Fe 4063 and Cr 4275 lines of the solar disk are presented in an attempt to resolve discrepancies between previous measurements (Wiehr, 1975, 1978) and the data of Stenflo et al. (1980). The present observations were made with the Locarno polarimeter improved by the insertion of a new KDP crystal having double transmission and double modulation amplitude to increase spectral resolution. The F3 4063.6 line is found to show resonance polarization, whereas Cr 4274.8 requires further observations to establish the possible presence of polarization. The present results for Ba(+) 4554 and Sr 4607 agree with both sets of previous results, however an excess polarization is observed in the blue wing rather than the red for Sr(+) 4087, in agreement with Wiehr (1975); the double reversal found by Stenflo et al. in the Na D2 core has also not been observed. Finally, the center-to-limb variation of the polarization maximum in the blue wings of Ca 4227 and Na D2 given by Wiehr (1975) are shown to yield different damping parameters when fitted to the calculations of Auer et al. (1980) than those deduced from the data of Stenflo et al.

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