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Magnetic fields at uranus.

N F Ness, M H Acuña, K W Behannon

    Science (New York, N.Y.)
    |July 4, 1986
    PubMed
    Summary
    This summary is machine-generated.

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    Voyager 2 discovered Uranus has a strong magnetic field and magnetosphere, characterized by an unusual 60-degree tilt. This oblique rotator model explains its complex magnetotail and auroral zones.

    Area of Science:

    • Planetary Science
    • Magnetohydrodynamics
    • Space Physics

    Background:

    • Uranus possesses a complex magnetosphere influenced by its unique internal structure and rotation.
    • Previous models suggested a simpler magnetic field configuration for Uranus.

    Purpose of the Study:

    • To analyze the magnetic field data from Voyager 2's Uranus flyby.
    • To characterize the magnetosphere and magnetic field of Uranus.
    • To investigate the relationship between the planet's rotation and its magnetic field.

    Main Methods:

    • In-situ measurements of the magnetic field by the Voyager 2 spacecraft.
    • Analysis of bow shock and magnetopause crossings.
    • Dipole modeling to represent the planetary magnetic field.

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    Main Results:

    • Uranus exhibits a strong planetary magnetic field and a well-developed magnetotail.
    • The magnetic field is best described by an offset dipole model with a significant tilt (60 degrees) relative to the rotation axis.
    • The magnetosphere features a detached bow shock at 23.7 Uranus radii and a magnetopause at 18.0 Uranus radii.

    Conclusions:

    • Uranus' magnetic field is that of an oblique rotator, deviating significantly from a simple axial dipole.
    • The large offset and tilt of the magnetic dipole influence auroral zone locations and the interaction of moons and rings with the magnetosphere.
    • The estimated rotation period of Uranus' interior and magnetic field is approximately 17.29 hours.