Multistream and Monte Carlo calculations of the sun's aureole

Details Multistream and Monte Carlo calculations of the sun's aureole Multistream and Monte Carlo calculations of the sun's aureole

Mar 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jats...33..537f&link_type=abstract

Journal of the Atmospheric Sciences, vol. 33, Mar. 1976, p. 537-543.

Physics

1

Atmospheric Scattering, Monte Carlo Method, Rayleigh Scattering, Solar Corona, Solar Radiation, Ultraviolet Radiation, Aerosols, Angular Distribution, Light Scattering, Mie Scattering, Radiant Flux Density

Scientific paper

The scattered UV intensities in the sun's aureole are calculated using both a multi-stream scattering method and a Monte Carlo approach. Angular distributions for both Rayleigh and aerosol scatterings are obtained with a realistic atmospheric model. Moderate- and sharply-forward-peaked phase functions of aerosol scattering, corresponding to realistic analytic size distributions, are incorporated. Results from the two independent calculations are in reasonable agreement for a realistic atmospheric model. The results indicate that the scattered UV intensity in the sun's aureole is about four orders smaller than the transmitted intensity while the scattered intensity for pure Rayleigh scattering is only 1-10 millionths times that of the transmitted sun. Based on these intensity ratios, we estimate that the integrated scattered contributions from the aureole to a well-collimated sun photometer of acceptance aperture 2-3 deg are below about 1% of the direct contribution.

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