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Multidimensional Radiation Hydrodynamics

In: Numerical Methods in Multidimensional Radiative Transfer

Author

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  • Wolfgang Kalkofen

    (Harvard-Smithsonian Center for Astrophysics
    Kiepenheuer Institut für Sonnenphysik)

Abstract

Summary We describe a time-dependent, multidimensional radiation-hydrodynamic problem for the H line of Ca II in the solar chromosphere and propose an empirical approach using time-independent, one-dimensional equations. The purpose of the investigation is to determine the salient features of the structure of the underlying atmosphere and to decide between two fundamentally different models of the chromosphere. We discuss the case of the oscillations of the small-scale calcium bright points in the quiet chromosphere, whose intensities fluctuate intermittently with periods near the acoustic cutoff period of 3 min. The observed profile of the H line shows that a bright point is formed by an acoustic wave traveling upward in downward-streaming gas. The shape of the oscillating gas is approximately that of a cone oriented vertically, with the apex in the photosphere and an opening angle of ∼90°. The effects of multidimensional radiative transfer on the solution of the equations of radiation hydrodynamics are likely to be small compared with the effects on 3D wave propagation, and the influence on the emergent radiation field may be treated in a perturbation approach.

Suggested Citation

  • Wolfgang Kalkofen, 2009. "Multidimensional Radiation Hydrodynamics," Springer Books, in: Guido Kanschat & Erik Meinköhn & Rolf Rannacher & Rainer Wehrse (ed.), Numerical Methods in Multidimensional Radiative Transfer, pages 247-257, Springer.
    • Handle: RePEc:spr:sprchp:978-3-540-85369-5_12
    DOI: 10.1007/978-3-540-85369-5_12
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