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Jupiter plasma wave observations: an initial voyager 1 overview.

F L Scarf, D A Gurnett, W S Kurth

    Science (New York, N.Y.)
    |June 1, 1979
    PubMed
    Summary

    Voyager I

    Area of Science:

    • Plasma physics
    • Planetary science
    • Radio astronomy

    Background:

    • The Voyager I spacecraft's journey provided unprecedented in-situ measurements of Jupiter's magnetosphere.
    • Understanding plasma wave phenomena is crucial for characterizing planetary environments.

    Purpose of the Study:

    • To analyze plasma wave data collected by Voyager I in Jupiter's magnetosphere.
    • To investigate the nature and origin of various wave emissions detected.
    • To derive an electron density profile of Jupiter's outer magnetosphere.

    Main Methods:

    • Utilized the Voyager I plasma wave instrument for data acquisition.
    • Analyzed low-frequency radio emissions, ion acoustic waves, and electron plasma oscillations.
    • Interpreted measurements of trapped radio waves and high-frequency electrostatic waves.

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    Main Results:

    • Detected diverse plasma waves, including ion acoustic waves and electron plasma oscillations, prior to Jupiter's bow shock.
    • Derived an electron density profile in the outer magnetosphere using trapped radio wave data.
    • Observed high-frequency electrostatic waves and whistler mode turbulence within the Io plasma torus, potentially linked to lightning.

    Conclusions:

    • Voyager I's plasma wave instrument provided detailed insights into Jupiter's magnetospheric plasma environment.
    • The detected waves offer clues about plasma dynamics, particle interactions, and Jovian lightning.
    • Further analysis is needed to identify some observed emissions in the tail region.