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Solar transition region response to variations in the heating rate
Mariska, J. T.; Doschek, G. A.; Boris, J. P.; Oran, E. S.; Young, T. R., Jr.
AA(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, DC), AB(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, DC), AC(U.S. Navy, Laboratory for Computational Physics, Washington, DC), AD(U.S. Navy, Laboratory for Computational Physics, Washington, DC), AE(U.S. Navy, Laboratory for Computational Physics, Washington, DC)
Astrophysical Journal, Part 1, vol. 255, Apr. 15, 1982, p. 783-796. Navy-NASA-sponsored research. (ApJ Homepage)
Publication Date:
Solar Physics
NASA/STI Keywords:
Chromosphere, Solar Corona, Solar Temperature, Stellar Models, Atmospheric Temperature, Coronal Loops, Hydrodynamic Equations, Ion Production Rates, Magnetic Flux, Magnetohydrodynamics, Nonequilibrium Plasmas, Periodic Variations, Temperature Distribution, Temperature Gradients, Time Dependence
Bibliographic Code:


The response of a numerical model for the upper chromosphere, transition region, and corona to variations in the energy input has been examined. The numerical model solves the set of one-dimensional two-fluid hydrodynamic equations in a simple vertical magnetic flux tube. The atmosphere responds to both the increase and decrease in energy deposition by smoothly readjusting the temperature gradient and the amount of material in the region of peak radiating efficiency to radiate away energy being deposited. At no time during this readjustment is a departure from a thin laminar transition region structure seen. In addition, a time-dependent description of the nonequilibrium ionization of all of the ionization stages of oxygen has been included. This calculation is coupled with the self-consistent calculations of the dynamical variables. It is found that the nonequilibrium ionization balance calculations for both heating and cooling small loops in the quiet sun predict relative ionic abundances which differ substantially from those which would be predicted by an equilibrium calculation

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