Linear hydrodynamical equations coupled with radiative transfer in a non-isothermal atmosphere. I - Method

Details Linear hydrodynamical equations coupled with radiative transfer in a non-isothermal atmosphere. I - Method Linear hydrodynamical equations coupled with radiative transfer in a non-isothermal atmosphere. I - Method

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...54..269s&link_type=abstract

Solar Physics, vol. 54, Oct. 1977, p. 269-288.

Other

45

Atmospheric Models, Energy Dissipation, Hydrodynamic Equations, Radiative Transfer, Solar Atmosphere, Adiabatic Conditions, Linear Equations, Nonisothermal Processes, Temperature Gradients

Scientific paper

A method coupling the hydrodynamic equations and radiative transfer in a realistic solar model atmosphere is described. The influence of the temperature gradient of the model and the radiative dissipation is pointed out. The effect of the large temperature gradient is important in layers where the optical depth (at 5000 A) is greater than 0.5; the ratio between the amplitude of the temperature and the velocity fluctuations decreases with altitude by a factor 2 between optical depths of 1 and 0.5; in the case of acoustic waves, the phase shift between these fluctuations is small. The radiative energy loss in thick layers (optical depth of unity) leads to a decrease in the vertical phase velocity of the waves and to damping of their amplitudes in layers of intermediate optical depth (between 0.01 and 0.5). The effect of dissipation is negligible in thin layers (optical depth of less than 0.01).

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