Investigation of oxygen O2(a1Δg) emission on the nightside of Venus: Nadir data of the VIRTIS-M experiment of the Venus Express mission |
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| Authors: | A V Shakun L V Zasova G Piccioni P Drossart and A Migliorini |
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| Institution: | (1) INAF, Istituto di Fisica Dello Spazio Interplanetario, Area di Ricerca di Tor Vergata, Via del Fosso del Cavaliere, 00133 Roma, Italy;(2) INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Roma, Italy;(3) LESIA Observatoire de Paris Meudon, Paris, France;(4) DLR, Berlin, Germany;(5) Dipartimento di Ingegneria Meccanica, Universit? di Padova, Berlin, Germany;(6) Dipartimento di Fisica, Universit? di Lecce, Lecce, Italy;(7) Osservatorio di Capodimonte, Napoli, Italy;(8) Osservatorio Astrofisico di Arcetri, Firenze, Italy;(9) Institut d’Astrophysique Spatial CNRS, Orsay, France;(10) Laboratoire de Glaciologie et Geophysique de l’Environment, Grenoble, France;(11) Space Physics Research Laboratory, The University of Michigan, Ann Arbor, USA;(12) Department of Earth and Space Science, University of Washington, Seattle, USA;(13) Lunar Planetary Laboratory, University of Arizona, Tucson, USA;(14) Polish Academy of Sciences, Warsaw, Poland;(15) NASA JPL, Pasadena, USA;(16) Universit? di Perugia, Perugia, Italy;(17) MPI, Katlenburg, Germany;(18) ESTEC, Amsterdam, The Netherlands; |
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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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