Variability of the Venus Oxygen Airglow

Details Variability of the Venus Oxygen Airglow Variability of the Venus Oxygen Airglow

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.2610b&link_type=abstract

American Astronomical Society, DPS meeting #38, #26.10; Bulletin of the American Astronomical Society, Vol. 38, p.526

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We have obtained spatially resolved near-IR spectroscopic observations of the night-side of Venus through the last three inferior conjunctions using IRIS2 on the Anglo-Australian 3.9m telescope and CASPIR on the 2.3m ANU telescope. The data are used to investigate the extreme variability of the spatial distribution and intensity of the O2 airglow emission feature at 1.27 microns. The airglow emission was very strong in September 2002, and much weaker in July 2004. Substantial night-to-night variations are also seen in both the intensity and spatial distribution of the emission. The emission is typically brightest near the anti-solar point, consistent with an upper atmosphere circulation in the form of a tidal flow from day-side to night-side. However, there are substantial variations from this typical pattern, with plumes of emission sometimes extending over long distances, and reaching regions close to the terminator. The Venus O2 airglow provides a probe of the chemistry and dynamics of the Venus upper atmosphere. These and earlier ground-based observations help to provide context for the more detailed studies that will be possible by the Venus Express spacecraft.

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