Long term variability of the coronal and post - coronal C IV region of the Oe star HD 93521

SACs in the C IV regions of HD 93521 We examine the timescale changes of C IV spectral lines of the Oe star HD 93521, during a period of 16 years, applying the model proposed by Danezis et al. (2003, 2005a, b). We found that the spectral lines consist of one or more Satellite Absorption Components (SACs or DACs) which construct the whole spectral profile. In this paper we present the time scale variation of the rotational and random velocities.