Jupiter’s Radio Rotation Period: 50 Years of Ticking

Details Jupiter’s Radio Rotation Period: 50 Years of Ticking Jupiter’s Radio Rotation Period: 50 Years of Ticking

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm23b1601s&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM23B-1601

Astronomy and Astrophysics

Astronomy

[2756] Magnetospheric Physics / Planetary Magnetospheres, [5744] Planetary Sciences: Fluid Planets / Orbital And Rotational Dynamics, [6954] Radio Science / Radio Astronomy

Scientific paper

We present an updated measurement of the radio rotation period of Jupiter. Our previous measurement used 35 years of fixed-frequency data at 18, 20, and 22 MHz from the University of Florida Radio Observatory (Higgins et al., JGR, 102, 1997). Data from the University of Chile was also included to supplement the Florida measurements. We add 15 years more data to give a complete 50-year data set from 1957 - 2007. Occurrence probability graphs shown as a function of Jupiter central meridian longitude are calculated, and a 12-year cross correlation method is employed to reduce source variability from orbital effects. The additional data not only provide an updated rotation period but also reduce uncertainties in the measurement. We also discuss whether a drift is possible in Jupiter’s magnetic field.

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