Abstract
Long-term variations of a planetary magnetic field are one of the few observables available for the study of planetary interiors and dynamo theory. Although variations of the geomagnetic field have been accessible to direct measurement for centuries, knowledge of the secular variations of other planetary dynamos is limited. We report here new limits on jovimagnetic secular variations found by comparison of a jovian internal field model1 obtained from the Voyager 1 magnetic field observations at epoch 1979.2 with the epoch 1974.9 Pioneer 11 O4 model2. No significant secular variation of either the magnitude or position of the jovidipole was found for the years 1974.9 to 1979.2, although a small Earth-like variation cannot be ruled out.
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Connerney, J., Acuña, M. Jovimagnetic secular variation. Nature 297, 313–315 (1982). https://doi.org/10.1038/297313a0
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DOI: https://doi.org/10.1038/297313a0
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