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Ground-based observation of the Venus 1.27-μm O2airglow

Authors
Journal
Advances in Space Research
0273-1177
Publisher
Elsevier
Publication Date
Volume
36
Issue
11
Identifiers
DOI: 10.1016/j.asr.2005.05.078
Keywords
  • Venus
  • Airglow
  • Near Infrared
  • Spectroscopy
  • Molecular Oxygen
  • Ground-Based Observation
Disciplines
  • Chemistry
  • Physics

Abstract

Abstract We conducted near-infrared imaging spectroscopy of the nightside of Venus with a 1.88-m telescope at Okayama Astrophysical Observatory, Japan. The 1.3-μm region spectra show 1.27-μm O 2 airglow feature and thermal emission from the lower atmosphere. A bright airglow feature of 5 mega-Rayleigh (1 MR = 10 12 photons cm −2 s −1 into 4π sr) was found at around the anti-solar point, as in the previous studies. The hemispheric distribution of 1.3-μm thermal emission shows an equatorial depression similar to that of the 2.3-μm region. The hemispheric distribution of the rotational temperature shows an enhancement at around the anti-solar point overlapping the bright region. This may suggest adiabatic and/or chemical heating due to downward flow.

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