Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....47...65k&link_type=abstract
Astronomy and Astrophysics, vol. 47, no. 1, Feb. 1976, p. 65-76.
Astronomy and Astrophysics
Astrophysics
29
Atmospheric Models, Chromosphere, Finite Difference Theory, Radiative Transfer, Solar Atmosphere, Transient Response, Boundary Value Problems, Equilibrium Equations, Hydrodynamic Equations, Nonlinear Equations, Partial Differential Equations, Thermodynamic Equilibrium
Scientific paper
A self-consistent method for the numerical modeling of transient phenomena in stellar atmospheres is developed. The nonlinear equations of hydrodynamics are solved together with the equations of radiative transfer and non-LTE ionization equilibrium, and consideration is given to one-dimensional (vertical) motions in a plane-parallel atmosphere which is initially in hydrostatic and statistical equilibrium. The radiative-transfer problem is treated for a two-level-plus-continuum hydrogen atom. The coupled partial differential equations are solved through complete linearization of the corresponding difference equations. The effects of a thermal pulse introduced at the bottom of a model solar chromosphere are calculated. The temperature perturbation produces a pressure pulse which runs upwards through the atmosphere and generates complex variations of temperature, velocity, and radiation.
Kneer Franz
Nakagawa Yasuhiro
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