Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a...102..415k&link_type=abstract
Astronomy and Astrophysics, vol. 102, no. 3, Oct. 1981, p. 415-423.
Astronomy and Astrophysics
Astrophysics
48
Interstellar Gas, Lyman Alpha Radiation, Proton Scattering, Radiative Transfer, Solar Protons, Solar Radiation, Backscattering, Gas Density, Hydrogen, Monte Carlo Method, Optical Thickness
Scientific paper
Numerical Monte Carlo solutions for the problem of solar Lyman-alpha 1216 A photons scattered from interplanetary hydrogen are obtained. The quantitative importance of multiple scattering to the analysis of Lyman-alpha sky background models is determined, and it is shown that an optically-thin medium underestimates the radial sky background intensity by 5-35%. The dependence of the intensity and the line profile on the position of a detector within the solar system is calculated, and results indicate a dependence of the multiple scattering factor on theta, and yield a simple expression for the calculation of the total radial intensity everywhere inside 40 AU. Finally, the Lyman-beta 1025 A backscattered intensity is shown to be essentially the optically-thin value with a 5% accuracy.
Richter Katrin
Thomas Gareth E.
Uwe Keller Horst
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