Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987kosis..25..292o&link_type=abstract
Kosmicheskie Issledovaniia (ISSN 0023-4206), vol. 25, Mar.-Apr. 1987, p. 292-300. In Russian.
Astronomy and Astrophysics
Astronomy
Ionospheric Electron Density, Planetary Ionospheres, Radio Occultation, Spaceborne Astronomy, Venus Atmosphere, Density Distribution, Night, Solar Cycles, Venera Satellites, Vertical Distribution
Scientific paper
Approximately 60 vertical profiles of electron density on the Venus nightside were obtained on the basis of Venera 15 and 16 two-frequency radio-occultation measurements. Data are presented which illustrate the strong space-time variability of the ionosphere. A comparison of the Venera 15 and 16 data with Venera 9 and 10 and Pioneer-Venus data shows that the characteristics of the vertical electron-density profiles vary with the phase of the 11-year solar cycle. Numerical simulation is used to assess the sensitivity of the two-frequency radio-occultation technique as applied to the study of the upper nightside atmosphere of Venus.
Osmolovskii I. K.
Samoznaev L. N.
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