Astrophysical Radiation Dynamics: The Prospects for Scaling |
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| Authors: | John I Castor |
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| Institution: | (1) Lawrence Livermore National Laboratory, L-16, Livermore, CA 94550, USA |
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| Abstract: | The general principles of scaling are discussed, followed by a survey of the important dimensionless parameters of fluid dynamics
including radiation and magnetic fields, and of non-LTE spectroscopy. The values of the parameters are reviewed for a variety
of astronomical and laboratory environments. It is found that parameters involving transport coefficients – the fluid and
magnetic Reynolds numbers – have enormous values for the astronomical problems that are not reached in the lab. The parameters
that measure the importance of radiation are also scarcely reached in the lab. This also means that the lab environments are
much closer to LTE than the majority of astronomical examples. Some of the astronomical environments are more magnetically
dominated than anything in the lab. The conclusion is that a good astronomical environment for simulation in a given lab experiment
can be found, but that the reverse is much more difficult.
PACS NOS: 95.30.Jx, 95.30.Lz, 97.10.Ex, 97.10.Gz, 98.62.Mw
The U.S. Government’s right to retain a non-exclusive, royalty-free license in and to any copyright is acknowledged. |
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| Keywords: | Hydrodynamics Radiation Scaling |
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