THE first in situ studies of the magnetosphere of Jupiter were conducted in November and December, 1973, by the spacecraft Pioneer 10. An analysis of the helium magnetometer data1 indicated that the planetary magnetic field was well represented by an offset tilted dipole (OTD) at distances less than 10Rj. (Rj=radius of Jupiter=71,372 km). But the movement (4.0 gauss Rj3) and tilt (10.6° at λIII=222°) of this model, identified at D2, yielded a field configuration and intensity which were inconsistent with several earlier independently derived estimates obtained from ground based observations of radio emissions2–6.
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ACUNA, M., NESS, N. Jupiter's main magnetic field measured by Pioneer 11. Nature 253, 327–328 (1975). https://doi.org/10.1038/253327a0
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