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Showing 1–10 of 10 results
Advanced filters: Author: Giuseppe Piccioni Clear advanced filters

  • The atmosphere of a transiting planet shields the stellar radiation enabling size and density stratification to be estimated. Here, the authors study Venus and show that the measured radius depends on the wavelength used, which has implications for Venus’s ionosphere and may help in planning future missions.

    • Fabio Reale
    • Angelo F. Gambino
    • Giuseppe Piccioni
    ResearchOpen Access
    Nature Communications
    Volume: 6, P: 1-6

  • Juno’s close flyby of Ganymede on 7 June 2021 allowed the infrared mapping spectrometer JIRAM to observe the surface at unprecedented spatial resolution. JIRAM’s detailed spectroscopic characterization reveals past extensive aqueous alteration on the moon, possibly together with hydrothermal activity.

    • Federico Tosi
    • Alessandro Mura
    • Diego Turrini
    Research
    Nature Astronomy
    Volume: 8, P: 82-93

  • Thermal rings at very high temperature around the floors of paterae on Io support the hypothesis that they represent active lava lakes, according to thermal imaging data from the Jovian Infrared Auroral Mapper on the Juno spacecraft

    • Alessandro Mura
    • Federico Tosi
    • Giuseppe Sindoni
    ResearchOpen Access
    Communications Earth & Environment
    Volume: 5, P: 1-6

  • When seen in ultraviolet light, Venus has contrast features that arise from the non-uniform distribution of unknown absorbers within the sulphuric acid clouds. This paper reports multi-wavelength imaging that reveals that the dark low latitudes are dominated by convective mixing that brings the ultraviolet absorbers up from depth. The bright and uniform mid-latitude clouds reside in the 'cold collar', which suppresses vertical mixing. In low and middle latitudes, the visible cloud top is located at a constant altitude of 72 ± 1 km in both the ultraviolet dark and bright regions, indicating that the brightness variations result from compositional differences caused by the colder environment.

    • Dmitry V. Titov
    • Fredric W. Taylor
    • Pierre Drossart
    Research
    Nature
    Volume: 456, P: 620-623

  • 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

  • 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