A New Determination of Jupiter's Radio Rotation Period

Details A New Determination of Jupiter's Radio Rotation Period A New Determination of Jupiter's Radio Rotation Period

Dec 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...18711602h&link_type=abstract

American Astronomical Society, 187th AAS Meeting, #116.02; Bulletin of the American Astronomical Society, Vol. 27, p.1447

Astronomy and Astrophysics

Astronomy

Scientific paper

The powerful radio noise emitted sporadically by Jupiter at decameter wavelengths has been monitored regularly at the University of Florida Radio Observatory since 1957, and at Maipu Radio Astronomy Observatory in Chile from 1957 to 1977. The Florida database now consists of 35 years of coverage for rotation period determinations, and for the investigation of other long-term effects. Adding new data collected at several frequencies from 1980 to 1992, and using a proven technique for rotation period determinations, we calculated a new magnetospheric rotation period for Jupiter. Our results indicate a period that is significantly longer than the International Astronomical Union's accepted System III (1965) period. We also conclude that there is a statistically significant drift toward longer rotation periods. Previous measurements were not sufficiently precise to detect the drift. This is the first evidence of variability of the global magnetic field of a planet other than Earth. The drift may be attributed to the slippage of the conducting core with respect to the rest of the planet, or perhaps to some other effect. Our result, if verified, will very likely be of considerable importance in the development of a model for the generation of the Jovian magnetic field, and in the general investigation of the interiors of the giant planets.

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