  Space plasma populations are known to be out of (local) thermodynamic
equilibrium, as observations show direct or indirect evidences of non-thermal
velocity distributions of plasma particles. Prominent are the anisotropies
relative to the magnetic field, anisotropic temperatures, field-aligned beams
or drifting populations, but also, the suprathermal populations enhancing the
high-energy tails of the observed distributions. Drifting bi-Kappa distribution
functions can model all these features and enable for a kinetic fundamental
description of the dispersion and stability of these collision-poor plasmas,
where process are conditioned mainly by wave-particle interactions. In the
present paper we derive the full set of components of the dispersion tensor for
magnetized plasma populations modeled by drifting bi-Kappa distributions. A new
solver called DIS-K (DIspersion Solver for Kappa plasmas) is proposed to solve
numerically the dispersion relations of high complexity. The solver is tested
comparing to the unstable wave solutions obtained with other codes, operating
in the limits of drifting Maxwellian and non-drifting Kappa models. The present
results provide valuable tools for realistic characterization of wave
fluctuations specific to the complex configurations measured in-situ in space
plasmas.
