Spontaneous tangential discontinuities and the optical analogy for static magnetic fields. VI. Topology of current sheets
作者:
E.N. Parker,
期刊:
Geophysical & Astrophysical Fluid Dynamics
(Taylor Available online 1990)
卷期:
Volume 53,
issue 1-2
页码: 43-80
ISSN:0309-1929
年代: 1990
DOI:10.1080/03091929008208922
出版商: Taylor & Francis Group
关键词: Tangential discontinuities;force-free fields;ihelicity
数据来源: Taylor
摘要:
The electric surface current in a tangential discontinuity in a force-free magnetic field is conserved. The direction of the current is halfway between the direction of the continuous fields on either side of the surface of discontinuity. Hence the current sheets, i.e. the surface of tangential discontinuity, have a topology that is distinct from the lines of force of the field. The precise nature of the topology of the current sheet depends upon the form of the winding patterns in the field. Hence, invariant winding patterns and random winding patterns are treated separately. Current sheets may have edges, at the junction of two or more topological separatrices. The current lines may, in special cases, be closed on themselves. The lines of force that lie on either side of a current sheet somewhere pass off the sheet across a junction onto another sheet. In most cases the current sheets extending along a field make an irregular honeycomb.
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