Evolution of Current Helicity in Full-Sun Simulations

Details Evolution of Current Helicity in Full-Sun Simulations Evolution of Current Helicity in Full-Sun Simulations

Feb 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1094..772y&link_type=abstract

COOL STARS, STELLAR SYSTEMS AND THE SUN: Proceedings of the 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun.

Physics

Electric And Magnetic Fields, Solar Magnetism, Corona, Magnetohydrodynamics And Plasmas

Scientific paper

The density of current helicity quantifies the location of twisted and sheared non-potential structures in a magnetic field. We simulate the continuous evolution over many solar rotations of the magnetic field in the Sun's global corona, in response to flux emergence and shearing by photospheric motions. The latitudinal distribution of current helicity in our simulation develops a clear statistical pattern, matching the observed hemispheric sign at active latitudes. Also in agreement with observations there is significant scatter and intermixing of both signs of helicity, and we find local values of current helicity density that are much higher than those predicted by linear force-free extrapolations. Forthcoming full-disk vector magnetograms from Solar Dynamics Observatory will provide an ideal opportunity to test our theoretical results.

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