A model for the penetration of Lyman alpha in the solar chromosphere

Details A model for the penetration of Lyman alpha in the solar chromosphere A model for the penetration of Lyman alpha in the solar chromosphere

May 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...328..856f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 328, May 15, 1988, p. 856-859.

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Chromosphere, Lyman Alpha Radiation, Radiative Transfer, Solar Atmosphere, Solar Spectra, Computational Astrophysics, Thermodynamic Equilibrium

Scientific paper

A multilevel calculation of the hydrogen spectrum by Skumanich and Lites, followed by a two-level representation of each transition, shows that all the solar Lyα photons are created in an optically thick layer in the high chromosphere above τ0 ≈ 102. The authors give a simplified model that demonstrates the penetration of Lyα into the lower chromosphere below the creation region, i.e., for τ0 > 102. A second-order escape probability approximation yields a simple analytical expression which accurately reproduces the behavior of the Lyα source function for 102 ⪉ τ0 ⪉ 5×106 provided the destruction probability, ɛ is set close to 10-6.

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