Analysis of the profiles of the solar S I lines at 1807 and 1900 A

Abstract

view Abstract Citations (1) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Analysis of the profiles of the solar S I lines at 1807 and 1900 Å. Doherty, L. R. ; McAllister, H. C. Abstract High-resolution profiles of five lines of S I have been obtained from rocket echelle spectra of a quiet region near the solar limb ( = 0.3). Lines in the 1807 A multiplet show strong central reversals; the 1900 A lines are nearly Gaussian in shape. Profiles computed with the chromospheric model of Vernazza, Avrett, and Loeser agree well with the central parts of the reversed lines if the nonthermal motion at heights above 1000 km is taken to be macroturbulence. The 1900 A lines are formed near the temperature minimum, and their observed width of 40 mA implies a turbulent motion of less than 1.2km 1 Coherent scattering provides the best fit to the wings of the reversed lines. Thus the 5 11807 A multiplet provides further evidence for the importance of partial redistribution in the formation of strong chromospheric lines. Computed absolute intensities are less than those observed by more than a factor of 2. Changes in the model which reduce this discrepancy are discussed. Subject headings: line profiles - Sun: chromosphere - Sun: spectra - ultraviolet: spectra Publication: The Astrophysical Journal Pub Date: June 1978 DOI: 10.1086/156190 Bibcode: 1978ApJ...222..716D Keywords: Chromosphere; Fine Structure; Line Spectra; Solar Spectra; Spectrum Analysis; Sulfur; Ultraviolet Spectra; Aerobee Rocket Vehicle; Atmospheric Turbulence; Atomic Spectra; Rocket Sounding; Solar Atmosphere; Solar Limb; Solar Physics; Line Profiles:Solar Chromosphere full text sources ADS |