Mapping the Temperature of the Venus Upper Atmosphere

Astronomy and Astrophysics – Astronomy

Scientific paper

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Scientific paper

We have observed the Venus 1.27μm oxygen airglow with full-disk spectral imaging using IRIS2 on the Anglo-Australian Telescope at a spectral resolving power of 2400. The airglow shows strong variation in intensity and spatial distribution from night to night. Using the rotational line strengths within the band, and a forward modelling approach to correct for telluric absorption, we have obtained 2D maps of the temperature of the emission. The emission is known from VIRTIS observations to occur at at an altitude of about 95km. We see substantial temperature structure in the emission and variability from night to night similar to that seen in intensity. The temperatures are generally higher than those from the VIRA standard profile, suggesting adiabatic heating of downwelling gas. There is a tendency for low temperatures to be seen where the emission is brightest.

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