The dependence of coronal hole size on large scale magnetic field strength

Physics

Scientific paper

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Coronal Holes, Magnetic Flux, Mathematical Models, Photosphere, Solar Magnetic Field, Magnetic Field Configurations, Magnetohydrodynamics, Polytropic Processes, Solar Corona, Solar Physics

Scientific paper

The importance of mathematical models of the coronal structure for studies of coronal energetics, to simulate global flows of the solar wind, and to obtain reliable solar terrestrial predictions is discussed. Previous coronal models, including an example of a coronal MHD flow model, are reviewed. The development of a coronal model which is a logical extension of earlier models and which allows a closer relationship to the photospheric magnetic field as it is observed daily is described. The calculations are outlined. The assumptions of the model are: axisymmetric flow with no rotation, resulting in two dimensional flow in a meridional plane; zero viscosity and infinite electrical conductivity; polytropic, single fluid flow; and no momentum addition.

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