  We consider resonant inverse Compton scattering of thermal photons by
secondary particles above the pulsar polar gap. The process appears to be an
essential energy loss mechanism for the particles. The distribution function of
the secondary plasma particles is found to be strongly affected by the
scattering. It becomes two-humped implying the development of two-stream
instability. The resonantly upscattered Compton photons are found to gain
energy of 1 - 10 MeV forming an additional component in the pulsar gamma-ray
spectrum. The corresponding gamma-ray flux is estimated as well.
