  We develop a dipole model describing the thermal far-field radiation of a
nanoparticle in close vicinity to a substrate. By including in our description
the contribution of eddy currents and the possibility to choose different
temperatures for the nanoparticle, the substrate, and the background, we
generalize the existing models. We discuss the impact of the different
temperatures, particle size, emission angle, and the distance dependence for
all four combinations of gold and SiC nanoparticles or substrates.
