Evolution of Current Helicity in Full-Sun Simulations

The density of current helicity quantifies the location of twisted and sheared nonpotential 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 sins of helicity, and we find local values of current helicity density that are much higher than those predicted by linear force-free extrapolations. Forthcoming dill-disk vector magnetograms from Solar Dynamics observatory will provide an ideal opportunity to test our theoretical results.