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Triton's Geyser-Like Plumes: Discovery and Basic Characterization.

L A Soderblom, S W Kieffer, T L Becker

    Science (New York, N.Y.)
    |October 19, 1990
    PubMed
    Summary
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    Voyager 2 discovered active geyser eruptions on Neptune's moon Triton. Solar heating of subsurface nitrogen ice likely drives these plumes, expelling material high into the atmosphere.

    Area of Science:

    • Planetary Science
    • Geophysics
    • Atmospheric Science

    Background:

    • Triton, Neptune's largest moon, exhibits dynamic geological activity.
    • Previous observations suggested potential cryovolcanic processes on Triton.

    Purpose of the Study:

    • To analyze and characterize the geyser-like eruptions observed on Triton.
    • To propose a mechanism driving these observed plumes.

    Main Methods:

    • Analysis of Voyager 2 imagery of Triton.
    • Modeling of potential subsurface processes.

    Main Results:

    • Discovery of at least four active geyser-like eruptions on Triton.
    • Eruptions eject dark material up to 8 km high, forming downwind clouds over 100 km.

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  • A model suggests solar heating of subsurface nitrogen ice drives explosive venting.

    • Conclusions:

    • The observed eruptions are consistent with a nitrogen ice sublimation model.
    • A modest temperature increase (<4 K) is sufficient to power these plumes.
    • Each eruption may sublimate approximately 0.1 km³ of ice over its duration.