Vertical extent of the nighttime ionosphere of Venus

Computer Science – Sound

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Ionospheric Electron Density, Planetary Ionospheres, Satellite Sounding, Venera Satellites, Venus Atmosphere, Vertical Distribution, Electron Density Profiles, Night Sky, Radio Occultation, Transmission Lines

Scientific paper

A repeated analysis of results of 22 radio-occultation sessions of the Venera 9 and 10 satellites was performed in order to obtain an improved determination of the vertical extent of the nighttime ionosphere of Venus. In order to reduce the effect of plasma on the spacecraft-earth communication channel, simultaneous measurements of variations of integral electron density in the channel were made by another satellite for six radio-occultation sessions. It is shown that the measured value of electron density is close to the measurement error (about 300/cu cm) at heights not exceeding 150-200 km. This ionosphere boundary is significantly lower than that determined on the basis of Pioneer-Venus measurements.

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