It is shown that intense neutrino fluxes can nonlinearly generate elliptically polarized electromagnetic waves in ionized super-dense gases immersed in an external magnetic field. For this purpose, dispersion relations for obliquely (perpendicularly) propagating (with respect to the direction of the ambient magnetic field lines) helicons (extraordinary modes) influenced by the neutrino ponderomotive force are derived. The growth rates of the decay interactions are presented. These processes may contribute to the conservation of neutrino spins in supernova explosions.
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