2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/177612To one loop the effective neutrino photon interaction takes place through the vector-vector type and the axialvector-vector type amplitude. In this work we explicitly write down the form of the axialvector-vector amplitude to all orders in the external magnetic field in a medium. We then infer upon its zero external momentum limit which contributes to the effective charge of the neutrinos inside a magnetized medium. We further show its gauge invariance properties.1 tex file. To be published in Phys.Rev. DHigh Energy Physics - Phenomenologytext