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Showing 1–8 of 8 results
Advanced filters: Author: J. Deighan Clear advanced filters

  • Collisions of dust particles with a planet’s atmosphere lead to the accumulation of metallic atoms at high altitudes. MAVEN spacecraft observations reveal a persistent—but temporally variable—metal layer of Mg+ ions in the Martian atmosphere.

    • M. M. J. Crismani
    • N. M. Schneider
    • B. M. Jakosky
    Research
    Nature Geoscience
    Volume: 10, P: 401-404

  • The MAVEN spacecraft observed brightening in the Lyman-α line correlated with solar wind activity, which can be attributed to auroral activity by solar wind protons interacting with the Martian neutral hydrogen corona. Proton aurorae are normally seen at Earth only.

    • J. Deighan
    • S. K. Jain
    • B. M. Jakosky
    Research
    Nature Astronomy
    Volume: 2, P: 802-807

  • Most of Mars’s initial water has been lost through atmospheric escape, but seasonal imbalances of measured hydrogen loss compared to oxygen are enigmatic. Photochemical models suggest that seasonal water vapour at high altitudes enhances hydrogen loss rates.

    • M. S. Chaffin
    • J. Deighan
    • A. I. F. Stewart
    Research
    Nature Geoscience
    Volume: 10, P: 174-178

  • The authors used deep learning to derive a biological clock based on routine blood markers in mice that distinguishes slow-aging from fast-aging animals. Drawing on data from the NIH Study of Longitudinal Aging in Mice and a study of aging at The Jackson Laboratory, this clock reveals that platelets are key in predicting biological age.

    • Jorge Martinez-Romero
    • Maria Emilia Fernandez
    • Rafael de Cabo
    Research
    Nature Aging
    Volume: 4, P: 1882-1896

  • Water loss to space late in Venus history is shown to be more active than previously thought, with unmeasured HCO+ dissociative recombination dominating present-day H loss.

    • M. S. Chaffin
    • E. M. Cangi
    • H. Gröller
    Research
    Nature
    Volume: 629, P: 307-310

  • Multi-spacecraft observations of temperature, dust and water ice opacities, water vapour abundances, and thermospheric hydrogen in the atmosphere of Mars during a local dust storm show that even such regional events, much more frequent than global dust storms, can boost global atmospheric escape by a factor of five to ten.

    • M. S. Chaffin
    • D. M. Kass
    • O. I. Korablev
    Research
    Nature Astronomy
    Volume: 5, P: 1036-1042