Neutrino emission from supernovae in the presence of magnetic fields

Abstract

Neutrino burst observations from SN1987A indicate that the density and the temperature of the source and the propagation of the neutrinos in the medium are markedly different from those of solar and terrestrial conditions. If the magnetic field rises to as much as 10 to the 8th G at the neutrino source, then for a neutrino diffusion time-scale of 10 sec the neutrinos could flip helicity even in the case of a neutrino magnetic moment as small as 10 to the -24th micro-B.