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Structure of the solar chromosphere. III - Models of the EUV brightness components of the quiet-sun
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Semiempirical models of the quiet solar chromosphere are derived by solving non‑LTE, optically thick radiative transfer equations for hydrogen, carbon, and other species. The study aims to determine semiempirical models for six components of the quiet solar chromosphere. The authors solve statistical equilibrium, radiative transfer, and hydrostatic equilibrium equations for a given temperature–height distribution, iteratively adjusting the temperature profile until the computed emergent EUV spectrum matches Harvard Skylab observations of quiet‑sun regions. Published in The Astrophysical Journal Supplement Series, April 1981, DOI 10.1086/190731.
view Abstract Citations (2270) References (105) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Structure of the solar chromosphere. III. Models of the EUV brightness components of the quiet sun. Vernazza, J. E. ; Avrett, E. H. ; Loeser, R. Abstract The described investigation is concerned with the solution of the non-LTE optically thick transfer equations for hydrogen, carbon, and other constituents to determine semiempirical models for six components of the quiet solar chromosphere. For a given temperature-height distribution, the solution is obtained of the equations of statistical equilibrium, radiative transfer for lines and continua, and hydrostatic equilibrium to find the ionization and excitation conditions for each atomic constituent. The emergent spectrum is calculated, and a trial and error approach is used to adjust the temperature distribution so that the emergent spectrum is in best agreement with the observed one. The relationship between semiempirical models determined in this way and theoretical models based on radiative equilibrium is discussed by Avrett (1977). Harvard Skylab EUV observations are used to determine models for a number of quiet-sun regions. Publication: The Astrophysical Journal Supplement Series Pub Date: April 1981 DOI: 10.1086/190731 Bibcode: 1981ApJS...45..635V Keywords: Atmospheric Models; Brightness Temperature; Chromosphere; Extreme Ultraviolet Radiation; Nonequilibrium Thermodynamics; Radiative Heat Transfer; Solar Atmosphere; Ultraviolet Spectra; Atmospheric Heating; Atomic Energy Levels; Carbon; Graphs (Charts); Hydrogen Atoms; Iron; Lyman Spectra; Solar Temperature; Tables (Data); Solar Physics full text sources ADS |