From that model can be constructed sequences of seismically equivalent models in dynamical balance which incorporate meridional flow and a magnetic field. Selection amongst them must be based on nonseismic criteria, which might depend on dynamical considerations such as stability criteria, and which will also require inversions leading to the angular velocity distribution, from which, amongst other things, the centrifugal force which contributes to the aspherical distortion can be calculated. The diagnosis of noaxisymmetric asphericity is more complicated, and research in this area is still in its infancy. The procedure proposed for their determination is to ascertain which amongst a set of parameterized spatial masks provides signals that are most nearly consistent with a set of resonant oscillations of a model of a temporally varying cavity. Techniques for carrying out such an analysis are currently under investigation but have not yet been applied to real data.
Local analyses are probably best for assessing small-scale asphericity.
Associated with a putative meridional flow are fluxes of heat and material, which influence the temperature and composition of the energy generating core and thereby impinge on the solar neutrino problem.