  The multiple scattering of light in a gas of ultra cold atoms is responsible
for many exciting features observed in magneto-optical traps including the
collective behavior forced by a Coulomb like potential. This field also induces
plasma like phenomena in the cloud which allows the treatment of the system as
a one component trapped plasma. With a fluid description and casting the
thermodynamical behavior in the form of a polytropic equation of state we
investigate the equilibrium profiles of rotating clouds and its dependence on
the experiment characteristics. Numerical solutions predict the formation of
stable orbital modes both in rotating and non rotating clouds. We also
investigate the normal modes on such rotating systems.
