Coronal ForceFree Magnetic Field  Source Surface Model
Abstract
Models of the magnetic field in the solar chromosphere and corona are still mainly based on theoretical extrapolations of photospheric measurements. For the practical calculation of the global field, the socalled sourcesurface model has been introduced, in which the influence of the solar wind is described by the requirement that the field be radial at some exterior (source) surface. Then the assumption that the field is currentfree in the volume between the photosphere and this surface allows for its determination from the photospheric measurement. In the present paper a generalization of the sourcesurface model to forcefree fields is proposed. In the generalized model the parameterα( = ∇ ×B·B/B ^{2})must be nonconstant (or vanish identically) and currents are restricted to regions with closed field lines. A mathematical algorithm for computing the field from boundary data is devised.
 Publication:

Solar Physics
 Pub Date:
 April 1993
 DOI:
 10.1007/BF00627591
 Bibcode:
 1993SoPh..144..243A
 Keywords:

 ForceFree Magnetic Fields;
 Solar Atmosphere;
 Solar Corona;
 Solar Magnetic Field;
 Solar Physics;
 Chromosphere;
 Photosphere;
 Solar Wind;
 Solar Physics