Acoustic dissipation and H/-/ radiation in the solar chromosphere. II

Abstract

view Abstract Citations (10) References (16) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Acoustic dissipation and H- radiation in the solar chromosphere. II. Kalkofen, W. ; Ulmschneider, P. Abstract The relation between mechanical heating and radiative cooling in the solar chromosphere is investigated, and the dependence of the temperature rise on the mechanical dissipation rate and on the microscopic state of H(-) ions at the foot of the chromosphere is studied. It is found that H(-) is very nearly in local thermodynamic equilibrium (LTE) at the temperature minimum; but near the upper end of the range where H(-) dominates the opacity, deviations from LTE should be taken into account in estimating the mechanical energy input from the empirical temperature distribution. The use of empirical models for calculating the mechanical energy input into the chromosphere is considered. The estimate of mechanical heating implied by the recent work of Pradeire and Thomas (1976) is found to be too low by about an order of magnitude. Publication: The Astrophysical Journal Pub Date: January 1979 DOI: 10.1086/156776 Bibcode: 1979ApJ...227..655K Keywords: Acoustic Attenuation; Chromosphere; H Lines; Hydrogen Ions; Solar Temperature; Atmospheric Attenuation; Atmospheric Heating; Radiative Heat Transfer; Stellar Models; Temperature Distribution; Thermodynamic Equilibrium; Solar Physics; Opacities:Solar Chromosphere; Solar Chromosphere:Energy Transport full text sources ADS |