Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315..385d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 1, 1987, p. 385-407. NASA-Navy-sponsored research.
Astronomy and Astrophysics
Astrophysics
23
Chromosphere, Finite Difference Theory, Magnetohydrodynamic Flow, Thermal Stability, Turbulent Flow, Energy Dissipation, Flow Velocity, Perturbation Theory, Solar Atmosphere, Solar Corona
Scientific paper
The nonlinear evolution of a radiation-driven thermally unstable planar fluid is simulated numerically using a semiimplicit finite-difference algorithm. When the equilibrium state of the fluid is perturbed by random initial excitation of the velocity field, dense, cool, two-dimensional structures are found to form in a rarer, warmer surrounding medium. The nonlinear phase of evolution is characterized by the turbulent contraction of the condensed region, accompanied by a significant increase in the amount of energy radiated. It is found that, if the random velocity perturbation has a sufficiently large amplitude, the fluid will not form condensed structures. Finally, the relationship of these results to observations of the solar chromosphere, transition region, and corona is discussed.
Dahlburg Russell B.
DeVore Richard C.
Karpen Judith T.
Mariska John T.
Picone Michael J.
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