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- Title
ELECTRIC CURRENT DENSITY AND RELATED SIGMOID IN AN ACTIVE REGION.
- Authors
Joulin, V.; Schmieder, B.; Aulanier, G.; Bommier, V.
- Abstract
Using THEMIS vector magnetograms we measured vertical electric current density in the leading sunspot of NOAA 11127 active region during its disk passage. The current structures evolve versus time. MHD modelling allows us to explain the spiral pattern by torsion. We found observational visible counterparts in the SDO/AIA 335 A images. The field lines are visible as loops in the AIA images. When the torsion is increasing, a sigmoid is observed. In the present event observed on November 24th 2010, we find that reconnection is also necessary to explain their sigmoidal shape.
- Subjects
ELECTRIC currents; SIGMOIDOSCOPY; SUNSPOTS; TORSION; ELASTIC solids
- Publication
EAS Publications Series, 2012, Vol 55, p143
- ISSN
1633-4760
- Publication type
Article
- DOI
10.1051/eas/1255020