  We present a model for neutrino flares in accreting black holes based on the
injection of a non-thermal population of relativistic particles in a magnetized
corona. The most important products of hadronic and photohadronic interactions
at high energies are pions. Charged pions decay into muons and neutrinos; muons
also decay yielding neutrinos. Taking into account these effects, coupled
transport equations are solved for all species of particles and the neutrino
production is estimated for the case of accreting galactic black holes.
