Variations of the Venusian nightglow

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Nightglow, Planetary Radiation, Venus Atmosphere, Atmospheric Composition, Diurnal Variations, Gas Transport, Maxima, Minima, Monatomic Gases, Night Sky, Oxygen, Planetary Limb, Venera 10 Satellite, Venera 9 Satellite

Scientific paper

Venera-9 and Venera-10 spectroscopic data on the Venusian nightglow are analyzed. The nightglow is found to occur in a layer whose height varies from 90 to 110 km, whose thickness varies from 6 to 25 km, and whose zenith intensity varies from 0.8 to 4.5 kR. The diurnal pattern of the nightglow has a maximum that is shifted 5 deg toward the morning near midnight, and two minima at hour angles of + and - 50 deg. It is shown that atomic oxygen is horizontally transported from the terminator to the night sector of the planet. Nightglow variations of the earth and Venus are compared.

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