  Collective excitations of N = 1 supersymmetric electromagnetic plasma are
studied. Since the Keldysh-Schwinger approach is used, not only equilibrium but
also non-equilibrium plasma, which is assumed to be ultrarelativistic, is under
consideration. The dispersion equations of photon, photino, electron and
selectron modes are written down and the self-energies, which enter the
equations, are computed in the Hard Loop Approximation. The self-energies are
discussed in the context of effective action which is also given. The photon
modes and electron ones appear to be the same as in the usual ultrarelativistic
plasma of electrons, positrons and photons. The photino modes coincide with the
electron ones and the selectron modes are as of free relativistic massive
particle.
