We present far-UV spectra of the three magnetic cataclysmic variables ( MCVs ) BY Cam , V1309 Ori and AE Aqr obtained with the FUSE satellite .
These MCVs have revealed strongly unusual NV and CIV UV resonance lines .
The FUSE spectra exhibit broad OVI lines as well as a strong NIII line at 991Ã , while the CIII 1175Ã line is nearly absent , supporting non-solar CNO abundances of the accreting matter in these sources .
The spectrum of BY Cam shows molecular H _ { 2 } lines which might be of circumstellar nature .
The flaring activity of AE Aqr is also observed in the far-UV range .
The radial velocities of the broad OVI components in AE Aqr are orbitally modulated and would indicate an emission region close to the magnetosphere .