Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227..655k&link_type=abstract
Astrophysical Journal, Part 1, vol. 227, Jan. 15, 1979, p. 655-663.
Astronomy and Astrophysics
Astrophysics
10
Acoustic Attenuation, Chromosphere, H Lines, Hydrogen Ions, Solar Temperature, Atmospheric Attenuation, Atmospheric Heating, Radiative Heat Transfer, Stellar Models, Temperature Distribution, Thermodynamic Equilibrium
Scientific paper
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.
Kalkofen Wolfgang
Ulmschneider Peter
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