Physics
Scientific paper
Jun 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..105..223s&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 105, June 1986, p. 223-235.
Physics
38
Lines Of Force, Magnetic Flux, Photosphere, Solar Activity, Solar Magnetic Field, Topology, Coronal Loops, Solar Corona, Thematic Mapping
Scientific paper
The field lines of closed magnetic structures above the photosphere define a mapping from the photosphere to itself. This mapping is discontinuous, and the field line connectivity to the boundary can change discontinuously in response to continuous changes of field strength and direction. The field has typically a cell structure due to the presence of segments of the zero line of the photospheric longitudinal field on which the transversal field is directed from negative (pointing into the sun) to positive fields. The cell boundaries are made up of field lines which all touch the photosphere on one of these line segments. Within each of the cells the field line mapping is continuous. When during a slow evolution a substantial part of a coronal loop or of an arcade has passed from one cell into another a fast dynamic instability may set in which was previously prevented by the anchoring of field lines in the dense photosphere.
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