Results are presented of a satellite experiment on the detection of VLF and ELF waves excited by irradiation of the night ionosphere F region by the _eld of a nonmodulated powerful radio wave[ The excited VLF and ELF waves have been detected at topside ionosphere altitudes h 499Γ0999 km in the frequency bands 6[4 kHz Β³ f Β³ 04 kHz and 7 Hz Β³ f Β³ 0[4 kHz at distances less than 49Γ099 km from the centre of the magnetic force tube passing through the heated spot of the ionosphere[ The region of wave occurrence has well!de_ned boundaries[ This points to propagation "guiding# of the observed low frequency waves along geomagnetic _eld lines[ Possible generation mechanisms for the low frequency emission observed are discussed[ It is shown that longitudinal ELF waves may be excited at altitudes of the topside ionosphere by beams of suprathermal electrons resulting from the action of a high!power radio wave on the ionosphere[ These waves have a small group velocity in the direction orthogonal to the magnetic _eld[ Occurrence of ELF oscillations detected onboard of satellite may be caused also by satellite motion in spatially inhomogeneous electrostatic _eld\ connected with arti_cial irregularities of plasma density and accelerated electron beams[ Whistler waves in the VLF band may result from conversion of lower!hybrid oscillations excited in the re~ection region of powerful radio wave due to scattering by arti_cial small scale _eld!aligned irregularities[ The whistlers generated can propagate to the satellite along arti_cial ducts formed within the disturbed magnetic force tube[ Γ 0887 Elsevier Science Ltd[ All rights reserved[