Generation and structure of the electric currents in a flaring activity complex

Details Generation and structure of the electric currents in a flaring activity complex Generation and structure of the electric currents in a flaring activity complex

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...185..306h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 185, no. 1-2, Oct. 1987, p. 306-314.

Astronomy and Astrophysics

Astrophysics

51

Electric Current, Photosphere, Plasma Dynamics, Solar Corona, Solar Flares, Solar Magnetic Field, Radial Distribution, Solar Activity, Vortices

Scientific paper

Assuming the existence of organized photospheric velocity fields in an active region, the creation of photospheric and coronal dc currents by vortex and radial motions is studied. Vortex motions leading to opposite temporal evolutions of the magnetic flux in old and new centers of activity create two systems of coronal currents flowing along the lines of force that, in the active region complex, connect the old center of activity to the new. The magnetic energy stored in these currents is higher than the energy of the largest flares. The effect of radial photospheric motions is also discussed. Two systems of coronal currents can be distinguished. They are located inside two different magnetic cells, and interact along the separator which is the intersection of the magnetic line surfaces that separate the magnetic cells produced by the photospheric magnetic sources. Due to source motions and electric current evolution, the separator may be the location of reconnection of the magnetic field. The separator being perpendicular to the two current systems, this reconnection may affect the magnetic field lines of a significant fraction of the loop current systems, interrupting the currents and quickly releasing the stored magnetic energy.

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