  Sources of magnetic fields from grand unified theories are studied in the
warm inflation regime. A ferromagnetic Savvidy vacuum scenario is presented
that yields observationally interesting large scale magnetic fields. As an
intermediate step, a general analysis is made of defect production at the onset
of warm inflation and monopole constraints are obtained. Many features of this
Savvidy vacuum scenario are applicable within a supercooled inflation regime
and these points are discussed.
