The solar aureola - Theory and observations

Details The solar aureola - Theory and observations The solar aureola - Theory and observations

Dec 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...240..203b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 240, no. 1, Dec. 1990, p. 203-208. Research supported by Universita di Firenze

Physics

Optics

9

Atmospheric Optics, Light Scattering, Seeing (Astronomy), Crosstalk, Pixels, Telescopes

Scientific paper

The stray light, which originates in the earth atmosphere and in the telescope optics, produces a 'cross-talk' between spectral as well as intensity information held in different picture elements. In this paper the mathematical formulation of the scattering processes and their dependence on the wavelength and on the zenith distance of the source are discussed and compared with aureola observations carrried out at the G.B. Donati Solar Tower in Arcetri. The analysis confirms the zenith and wavelength dependence of the relevant aureola parameters as given by the theory, and shows that the logarithmic description of the aureola intensity, sometime given by other authors, correctly applies also to the Arcetri measurements. This result suggests the possibility of evaluating the stray light effects on spectroscopic and photometric observations stemming from a few aureola measurements performed at given distances from the solar limb.

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