Detection of ionospheric layers in the dayside ionosphere of Venus at altitudes of 80–120 km from Venera-15 and -16 two-frequency radio-occultation results

We propose a technique for analyzing radio-occultation data that allows the effects of the noise, ionosphere, and atmosphere on the radio-occultation results to be reliably separated. This enables a more accurate investigation into the ionosphere formation mechanisms. Ionized layers are shown to exist in the dayside ionosphere of Venus at altitudes from 80 to 120 km. The position of the lower boundary of this ionized region can vary over the range of 80–100 km and the electron density gradients can change several times several.