2017/10/31 by R. Casini, R. Manso Sainz, T. del Pino Alemán +1 · 1 citation
Environmental Science · Physics and Astronomy · #Atmospheric aerosols and clouds #Balmer series #Coherence (philosophical gambling strategy) #Emissivity #Formalism (music) #Ionosphere and magnetosphere dynamics #Polarization (electrochemistry) #Rayleigh scattering #Scattering #Solar and Space Plasma Dynamics #Spectral line #astro-ph.SR
paper · pdf · doi:10.3847/1538-4357/aa9654
published in The Astrophysical Journal 850(2), 162 (IOP Publishing)
arxiv created 2017/10/31 · openalex created_date 2017/11/10 · openalex publication_date 2017/11/28 · arxiv updated 2017/12/13 · openalex updated_date 2026/08/05
Abstract We derive a formalism to describe the scattering of polarized radiation over the full spectral range encompassed by atomic transitions belonging to the same spectral series (e.g., the H i Lyman and Balmer series, the UV multiplets of Fe i and Fe ii ). This allows us to study the role of radiation-induced coherence among the upper terms of the spectral series, and its contribution to Rayleigh scattering and the polarization of the solar continuum. We rely on previous theoretical results for the emissivity of a three-term atom of the Λ-type, taking into account partially coherent scattering, and generalize its expression in order to describe a “multiple Λ” atomic system underlying the formation of a spectral series. Our study shows that important polarization effects must be expected because of the combined action of partial frequency redistribution and radiation-induced coherence among the terms of the series. In particular, our model predicts the correct asymptotic limit of 100% polarization in the far wings of a complete (i.e., <?CDATA \rmΔ L=0,± 1?> ) group of transitions, which must be expected on the basis of the principle of spectroscopic stability.