  We further generalize the powerful method, which we have recently developed
for description of the background matter influence on neutrinos, for the case
of an electron moving in matter. On the basis of the modified Dirac equation
for the electron, accounting for the standard model interaction with particles
of the background, we predict and investigate in some detail a new mechanism of
the electromagnetic radiation that is emitted by moving in matter electron due
to its magnetic moment. We have termed this radiation the ``spin light of
electron" in matter and predicted that this radiation can have consequences
accessible for experimental observations in astrophysical and cosmological
settings.
