  Thermal effects on the properties of four electromagnetic waves propagating
in the pulsar magnetosphere are analyzed. It is shown that thermal effects
change only quantitatively the dispersion properties of superluminal ordinary
O-mode freely escaping the pulsar magnetosphere; properties of the
extraordinary X-mode remain unchanged. As for two subluminal waves propagating
along magnetic field lines, for them thermal effects result in essential
absorption. However, this attenuation occurs at considerable distances from the
neutron star, so there is no doubt in their existence.

High Energy Astrophysical Phenomena