Abstract
The linear theory of the ion-acoustic instability in the E-region ionospheric plasma has been studied. The instability can generate ion-acoustic waves with dispersion equation ω = csk and with wavelengths of order of a metre in the region of small aspect angles θ < 1°. This instability can be used for interpretation of coherent backscatter type I events. Considering the ion-acoustic instability it is also possible to explain rocket measurements during the ROSE project of waves with phase velocities smaller than the ion-acoustic velocity and dependent on frequency.
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