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magnetic helicity topology magnetic fields knots dynamo parker hypothesis magnetic field relaxation navier-stokes numerical resistivity braids plasmas solar physics mhd numerical code simulations magnetic field physics magnetic vector potentials current formation magnetic nulls superflares flares stars kepler satellite fractional derivatives periodic domains magnetic relaxation fixed point index gauge turbulence quenching solar dynamo iucaa knot borromean rings trefoil knot julia numerics cfd mathematics twist kelvin-helmholtz fluid mechanics bubbles galaxies numerical viscosity numerical dissipation finite difference numerical analysis periodic box vector potential magnetohydrodynamics vorticity plasma sun magneti fields hopf fibration topological entropy chaos glass relaxation dielectric spectroscopy