Nonlinear aspects of planar condensational instability

Details Nonlinear aspects of planar condensational instability Nonlinear aspects of planar condensational instability

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987stin...8723565d&link_type=abstract

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Computer Science

Chromosphere, Computerized Simulation, Finite Difference Theory, Radiative Transfer, Solar Corona, Amplitudes, Contraction, Nonlinear Systems, Nonlinearity, Perturbation, Turbulence, Velocity

Scientific paper

The numerical simulation of the nonlinear evolution of a radiation driven thermally unstable planar fluid, using a semi-implicit finite difference algorithm is discussed. When the equilibrium state of the fluid is perturbed by random initial excitation of the velocity field, dense, cool, two dimensional structures are observed forming 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. 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.

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