Suprathermal electrons generated by the interaction of powerful radio wavewith the ionosphere

We present two sets of observations of suprathermal electrons, produced by the interaction of powerful radio wave with the ionosphere, as seen using t he incoherent scatter radar (ISR) technique. The observational data are com pared with the theory of multiple acceleration of electrons in the strongly excited resonance region near the reflection point of the powerful radio w ave. The structure of the wide perturbed region filled with energetic (10-2 0) eV electrons is determined. The size of this region along the Earth magn etic field is shown to be 100 km. The full power going to the accelerated p articles is determined: it is 6-8 kW or (4-6)% of the entire HF radiated po wer. The power carried by the suprathermal electrons flux escaping into mag netosphere is of the order 1 kW.