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Results from the GSFC fluxgate magnetometer on Pioneer 11A high-field triaxial fluxgate magnetometer was mounted on Pioneer 11 to measure the main magnetic field of Jupiter. It is found that this planetary magnetic field is more complex than that indicated by the results of the Pioneer 10 vector helium magnetometer. At distances less than 3 Jupiter radii, the magnetic field is observed to increase more rapidly than an inverse-cubed distance law associated with any simple dipole model. Contributions from higher-order multipoles are significant, with the quadrupole and octupole being 24 and 21 percent of the dipole moment, respectively. Implications of the results for the study of trapped particles, planetary radio emission, and planetary interiors are discussed. Major conclusions are that the deviation of the main planetary magnetic field from a simple dipole leads to distortion of the L shells of the charged particles and to warping of the magnetic equator. Enhanced absorption effects associated with Amalthea and Io are predicted.
Document ID
Document Type
Conference Proceedings
Acuna, M. H.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Ness, N. F.
(NASA Goddard Space Flight Center Greenbelt, Md., United States)
Date Acquired
August 8, 2013
Publication Date
January 1, 1976
Subject Category
Lunar And Planetary Exploration
Meeting Information
Colloquium on Jupiter: Studies of the interior, atmosphere, magnetosphere and satellites(Tucson, AZ)
Accession Number
Distribution Limits

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