Abstract
The possibility to create small scale plasma density fluctuations at the initial stage of ionospheric modification by powerful HF radio waves is discussed. The thermal self-focusing instability of plasma waves excited in the reflection region of the pump is considered as a main source of striations. Ponderomotive effects are also taken into account resulting in a decrease of the scales of the instability orthogonal to the magnetic field and a strong increase of the growth rate. Striations produced by the self-focusing instability can be a source of initial fluctuations at the upper hybrid resonance level of the pump necessary to striation development at further stages of the ionospheric modification.
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