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The properties of corona discharge were study by electro-physical and spectral methods in the supercritical phase at 6 K , 11 K 150 K and 300 K as well as in normal liquid helium at 4.2 K within the pressure range of 0.1-10 MPa. The electro-physical investigations (measurement of corona current as a function of the applied voltage) gave information about the mobility of charged particles in the medium. The measured current-voltage characteristics allow for the calculation of the charged particle mobilities (i.e., electrons for negative corona and positive ions for positive corona).