  The interaction of microquasar jets with their environment can produce
non-thermal radiation as is the case for extragalactic outflows impacting on
their surroundings. We have developed an analytical model based on those
successfully applied to extragalactic sources. The jet is taken to be a
supersonic and mildly relativistic hydrodynamical outflow. We focus on the
jet/shocked medium structure when being in its adiabatic phase, and assume that
it grows in a self-similar way. We calculate the fluxes and spectra of the
radiation produced via synchrotron, Inverse Compton and relativistic
Bremsstrahlung processes by electrons accelerated in strong shocks. A
hydrodynamical simulation is also performed to further investigate the jet
interaction with the environment and check the physical parameters used in the
analytical model. We conclude that microquasar jet termination regions could be
detectable at radio wavelengths for current instruments sensitive to arcminute
scales while at X-rays the expected luminosities are moderate, although the
emitter is more compact than the radio one. The radiation at gamma-ray energies
may be within the detection limits of the next generation of satellite and
ground-based instruments.
