The influence of the stray light in the solar image on the Fraunhofer line profiles

Details The influence of the stray light in the solar image on the Fraunhofer line profiles The influence of the stray light in the solar image on the Fraunhofer line profiles

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...281..955b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 281, no. 3, p. 955-963

Astronomy and Astrophysics

Astrophysics

Data Reduction, Error Analysis, Fraunhofer Lines, Light Scattering, Solar Spectra, Velocity Errors, Astronomical Models, Astronomical Spectroscopy, Doppler Effect, Solar Rotation

Scientific paper

In the solar spectroscopy the scattered light produced by the Earth's atmosphere and telescope optics may bias the result of spectral and photometric measurements. The problem of correcting the spectral observations from the stray light has assumed a great importance in the studies of large-scale motion into the solar atmosphere. Nevertheless, it is not yet known how the light smearing may affect the observed values of the relevant parameters of the Fraunhofer lines, with the exception of their wavelengths (the so called 'velocity error') which has been already examined. In this paper we discuss the effects of the light scattering in the solar image on the spectroscopic measurements and we discuss some data reduction techniques. Moreover we calculate the analytical distribution of the velocity error over the solar disk, obtaining new insights on the understanding of the solar rotation peculiarities.

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