Noncentral collision of heavy ions can generate large magnetic field in its
neighbourhood. We describe a method to calculate the effect of this field on
the dilepton emission rate from the colliding region, when it reaches thermal
equilibrium. It is calculated in the real time method of thermal field theory.
We find that the rate is affected significantly only for lower momenta of
dileptons.Comment: 14 pages, 5 figures; Accepted for publication in Phys. Rev.