Consequences of the day-to-night variation of the exospheric temperature of Venus

Details Consequences of the day-to-night variation of the exospheric temperature of Venus Consequences of the day-to-night variation of the exospheric temperature of Venus

Feb 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979natur.277..546b&link_type=abstract

Nature, vol. 277, Feb. 15, 1979, p. 546-548.

Astronomy and Astrophysics

Astronomy

2

Atmospheric Temperature, Diurnal Variations, Exosphere, Venus Atmosphere, Astronomical Spectroscopy, Atmospheric Heating, Hydrogen Atoms, Lyman Alpha Radiation, Oxygen Atoms, Transport Properties, Venera 9 Satellite, Diurnal Variations, Temperatures, Atmosphere, Venera 9, Venus, Exosphere, Hydrogen, Photometry, Emissions, Ultraviolet, Observations, Models, Oxygen, Flux, Transport

Scientific paper

During the exploration of the planet Venus by the Soviet space probe Venera 9, the quantity of hydrogen in the upper atmosphere and its temperature was measured on the basis of an observation of far UV atmospheric emission. The temperature at the altitude of 250 km (the upper boundary of the atmosphere) was found to vary from 500 K on the dayside to 200 K on the nightside. This variation is compatible with the current knowledge of the heating of the upper atmosphere by solar radiation. It is shown that this variation, which is larger than on earth, induces an exospheric transport (out of the atmosphere) of hydrogen from the dayside to the nightside. An investigation shows that a large difference regarding the exosphere temperature exists with respect to day and night.

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