  In this paper we provide the first consideration of magnetosphere-ionosphere
coupling at Jupiter-like exoplanets with internal plasma sources such as
volcanic moons. We estimate the radio power emitted by such systems under the
condition of near-rigid corotation throughout the closed magnetosphere, in
order to examine the behaviour of the best candidates for detection with next
generation radio telescopes. We thus estimate for different stellar X-ray-UV
(XUV) luminosity cases the orbital distances within which the ionospheric
Pedersen conductance would be high enough to maintain near-rigid corotation,
and we then consider the magnitudes of the large-scale magnetosphere-ionosphere
currents flowing within the systems, and the resulting radio powers, at such
distances. We also examine the effects of two key system parameters, i.e. the
planetary angular velocity and the plasma mass outflow rate from sources
internal to the magnetosphere. In all XUV luminosity cases studied, a
significant number of parameter combinations within an order of magnitude of
the jovian values are capable of producing emissions observable beyond 1 pc, in
most cases requiring exoplanets orbiting at distances between ~1 and 50 AU, and
for the higher XUV luminosity cases these observable distances can reach beyond
~50 pc for massive, rapidly rotating planets. The implication of these results
is that the best candidates for detection of such internally-generated radio
emissions are rapidly rotating Jupiter-like exoplanets orbiting stars with high
XUV luminosity at orbital distances beyond ~1 AU, and searching for such
emissions may offer a new method of detection of more distant-orbiting
exoplanets.
