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Manuscript Title: ALFVEN: a two-dimensional code based on SHASTA, solving the radiative, diffusive MHD equations.
Authors: W.J. Weber, J.P. Boris, J.H. Gardner
Program title: ALFVEN
Catalogue identifier: ABUX_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 16(1979)243
Programming language: Fortran.
Computer: CDC 6500.
Operating system: SCOPE 3.4 RESP, OS-MVT, OS-MVS.
RAM: 55K words
Word size: 60
Peripherals: disc.
Keywords: Plasma physics, Astrophysics, Diffusive, Radiative Mhd, two-dimensional, Second-order accuracy, Explicit convection, Implicit diffusion, Monotonic solutions, Shasta numerical scheme, Low-diffusion scheme, Solar.
Classification: 1.6, 19.10.

Revision history:
Type Tit le Reference
correction 000A CORRECTION 26/09/80 See below

Nature of problem:
A two-dimensional computer program to be used for solving hydrodynamic and hydromagnetic equations in various geometries. The effects of gravity, ohmic dissipation and -diffusion, radiative losses and thermal conduction are included through an implicit, time-split coupled, step. The convective part of the equations is solved by the SHASTA numerical code, having second-order accuracy but guaranteeing monotonicity in the directly-convected quantities. One-dimensional and isothermal applications are possible. The program uses the equation for conservation of total energy (U-version).

Solution method:
Vectorized, two-dimensional explicit convection step with predictor- corrector ordening for second-order solution with removal of numerically produced extrema, time-split coupled to an implicit, tridiagonal matrix solver for physical conduction, radiation and diffusion.

Running time:
Achieving equilibrium in longest physical time scale will require typically 1200 time steps. Duration of one time step (-5% for adiabatic, -25% for diffusion free calculations): 22 s (CDC 6500), 6 s (CDC6600), 4s (IBM 370/168), 15 s (IBM 370/158) for a 63 X 43 grid in single precision.

CORRECTION SUMMARY
Manuscript Title: ALFVEN: a two-dimensional code based on SHASTA, solving the radiative, diffusive MHD equations. (C.P.C. 16(1979)243).
Authors: W.J. Weber, J.P. Boris, J.H. Gardner
Program title: 000A CORRECTION 26/09/80
Catalogue identifier: ABUX_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 21(1981)437
Classification: 1.6, 19.10.