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Showing 1–10 of 10 results
Advanced filters: Author: Tom S. Stallard Clear advanced filters

  • A dark, ribbon-like structure at Jupiter’s magnetic equator marks a depletion of ionospheric H3+ caused by a lack of photoelectrons. These photoelectrons, which collide with molecular hydrogen to form H3+, are deviated away by magnetic field lines.

    • Tom S. Stallard
    • Angeline G. Burrell
    • Rosie E. Johnson
    Research
    Nature Astronomy
    Volume: 2, P: 773-777

  • JWST has detected \({{\rm{H}}}_{3}^{+}\) and auroral emissions at Neptune—the only giant planet in the Solar System for which they had proved to be elusive up to now. The observations reveal a factor-of-two cooling of Neptune’s upper atmosphere compared with Voyager 2 data, indicative of energy balance processes acting on a shorter timescale than solar forcing.

    • Henrik Melin
    • Luke Moore
    • Katie L. Knowles
    ResearchOpen Access
    Nature Astronomy
    Volume: 9, P: 666-671

  • JWST and Keck II spectral observations of Saturn’s moon Titan reveal methyl (CH3) as well as non-local thermodynamic equilibrium emission bands of CO and CO2. Imaging shows clouds in Titan’s northern hemisphere at several epochs, with some appearing to evolve in altitude.

    • Conor A. Nixon
    • Bruno Bézard
    • Robert A. West
    Research
    Nature Astronomy
    Volume: 9, P: 969-981

  • A reanalysis of the Voyager 2 flyby of Uranus shows that it occurred during an extreme compression of the planet’s magnetosphere by the upstream solar wind. This would have had significant effects on the measurements made during the flyby.

    • Jamie M. Jasinski
    • Corey J. Cochrane
    • Neil Murphy
    ResearchOpen Access
    Nature Astronomy
    Volume: 9, P: 66-74

  • Planetary aurorae are formed by energetic charged particles streaming along the planet's magnetic field lines into the upper atmosphere from the surrounding space environment. At Saturn only the main auroral oval has been observed, but this paper reports the discovery of a secondary oval, ∼25 per cent as bright as the main oval.

    • Tom Stallard
    • Steve Miller
    • Michele Dougherty
    Research
    Nature
    Volume: 453, P: 1083-1085

  • New northern aurora emissions on Uranus in the infrared spectrum are detected after a 30-year search. The emissions, observed close to equinox, are most likely caused by the 88% increase in upper atmosphere column density.

    • Emma M. Thomas
    • Henrik Melin
    • Steve Miller
    ResearchOpen Access
    Nature Astronomy
    Volume: 7, P: 1473-1480

  • The discovery of Jupiter’s southern X-ray aurora reveals that it is tellingly different from the northern one, providing important clues to how Jupiter’s polar aurorae are generated.

    • Tom S. Stallard
    News & Views
    Nature Astronomy
    Volume: 1, P: 755-756