The initial flux of neutrinos from a supernova is mostly radial (say we are far from where they are produced but also far below the top of the dying star)? As the neutrinos help blow the top off the star do the density variations of the outer portions of the star act like a variable index of refraction and cause focusing of the radial neutrino flux? If so what might typical focusing power be 2X, 20X, ... times the average flux? Does the neutrino flux cause an electrical polarization of the expelled outer layers of the star, if so what might the maximum electrical fields be? If this polarization relaxes can we expect electromagnetic radiation? Thanks for any help!