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Showing 1–7 of 7 results
Advanced filters: Author: A. Soufflot Clear advanced filters

  • IMPORTANT information about the properties of the outermost layer of regolith on Phobos can be obtained from infrared thermal radiometry and spectrophotometry of the reflected radiation. From the analysis of Mariner 91,2, Viking 1,22–4 and ground-based experimental data it was concluded that the surface layer of Phobos consists of fine-grained material (regolith) 1 with a composition close to that of carbonaceous chondrites2,3. In the course of these measurements, Phobos was observed as a point-like object. Here we present results obtained with a resolution 1/20–1/40 of the mean Phobos diameter showing, for the first time, inhomogeneities in the thermal and spectral properties of the surface of Phobos.

    • L. V. Ksanfomalfty
    • V. I. Moroz
    • E. V. Petrova
    Research
    Nature
    Volume: 341, P: 588-591

  • Observations of infrared emission from CO2, O2 and NO established that photochemical and dynamic activity controls the structure of the upper atmosphere of Venus, but were unable to identify the altitude of the emission. But it is reported here that day-side CO2 emission extends from 90–120 km altitude, with a peak at ∼115 km. Night-side O2 emission peaks at 96 km and is visible over the range 95–100 km.

    • P. Drossart
    • G. Piccioni
    • Bernd Ulmer
    Research
    Nature
    Volume: 450, P: 641-645

  • Venus has a bright 'dipole' double-eye feature at the centre of a vast vortex that rotates around the north pole, and is surrounded by a cold 'collar'. Observations of Venus' south polar region are reported, where clouds with morphology much like those around the north pole are seen, but rotating somewhat faster.

    • G. Piccioni
    • P. Drossart
    • Bernd Ulmer
    Research
    Nature
    Volume: 450, P: 637-640