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Investigation of oxygen O2(a1Δ g ) emission on the nightside of Venus: Nadir data of the VIRTIS-M experiment of the Venus Express mission

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Abstract

The paper is devoted to studies of the oxygen 1.27 μm emission on the Venus nightside using nadir measurements with the imaging spectrometer VIRTIS. A map of the emission distribution in coordinates latitude-local time is drawn for the southern hemisphere, equatorial region, and low latitudes of the northern hemisphere on the basis of observations in the period from June 2006 to January 2008 (more than 600 runs). As it has been noted before, strong spatial and time variations of the emission were observed. Two maxima of the emission are found: the first one (expected) is observed near the antisolar point, and the second one (near 23:00 LT) is seen at latitudes of 30°–60° in the southern hemisphere. The average value of the emission intensity measured according to the nadir data is 1.0 ± 0.4 MR. The emission with the intensity exceeding the average one by a factor of 2–3 was detected at different times almost over the entire nightside of the southern hemisphere.

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Authors and Affiliations

  1. Space Research Institute, Russian Academy of Sciences, ul. Profsoyuznaya 84/32, Moscow, 117810, Russia

    A. V. Shakun & L. V. Zasova

  2. Institute of Space Astrophysics, Rome, Italy

    G. Piccioni & A. Migliorini

  3. Paris Observatory, Meudon, France

    P. Drossart

Authors
  1. A. V. Shakun
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  2. L. V. Zasova
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  3. G. Piccioni
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  4. P. Drossart
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  5. A. Migliorini
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Original Russian Text © A.V. Shakun, L.V. Zasova, G. Piccioni, P. Drossart, A. Migliorini, 2010, published in Kosmicheskie Issledovaniya, 2010, Vol. 48, No. 3, pp. 239–245.

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Shakun, A.V., Zasova, L.V., Piccioni, G. et al. Investigation of oxygen O2(a1Δ g ) emission on the nightside of Venus: Nadir data of the VIRTIS-M experiment of the Venus Express mission. Cosmic Res 48, 232–239 (2010). https://doi.org/10.1134/S0010952510030044

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  • DOI: https://doi.org/10.1134/S0010952510030044

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