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First plasma wave observations at neptune.

D A Gurnett, W S Kurth, R L Poynter

    Science (New York, N.Y.)
    |December 15, 1989
    PubMed
    Summary
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    Voyager 2 observed diverse plasma waves and dust impacts at Neptune. These findings reveal details about Neptune's magnetosphere and ring system dynamics.

    Area of Science:

    • Planetary Science
    • Plasma Physics
    • Magnetospheric Physics

    Background:

    • Neptune's magnetosphere and ring system are complex and not fully understood.
    • Previous missions provided limited data on plasma wave phenomena and dust distribution.

    Purpose of the Study:

    • To analyze plasma wave data and dust particle impacts detected by Voyager 2 during its Neptune encounter.
    • To characterize the plasma environment and dust distribution within Neptune's magnetosphere and ring plane.

    Main Methods:

    • Utilized the Voyager 2 plasma wave instrument to detect and analyze various plasma waves.
    • Recorded and quantified dust particle impacts on the spacecraft during ring plane crossings.

    Main Results:

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  • Observed numerous plasma waves including electron plasma oscillations, electrostatic turbulence, chorus, hiss, electron cyclotron waves, and upper hybrid resonance waves.
  • Detected low-frequency radio emissions propagating in a disklike beam along the magnetic equatorial plane.
  • Recorded high rates of micrometer-sized dust particle impacts, concentrated in a dense disk around the equatorial plane.

    • Conclusions:

    • The observed plasma waves provide insights into the dynamic processes within Neptune's inner magnetosphere.
    • The dust particle distribution suggests a localized, dense disk structure within Neptune's rings, with a more extended tenuous halo.