Decametric radio measurement of Jupiter's rotation period

Details Decametric radio measurement of Jupiter's rotation period Decametric radio measurement of Jupiter's rotation period

Oct 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979icar...40...87m&link_type=abstract

Icarus, vol. 40, Oct. 1979, p. 87-93.

Astronomy and Astrophysics

Astronomy

2

Decametric Waves, Jupiter (Planet), Planetary Rotation, Radio Astronomy, Cross Correlation, Histograms, Secular Variations, Statistical Analysis

Scientific paper

Results of determinations of Jupiter's average decametric-wave rotation period are reported. The residual longitude drift of 18, 20 and 22.2 GHz emission observed at stations in Florida and Chile was calculated from measurements of the longitudes of source A peak centers for apparitions separated by 12 years; the drift was assumed to be the longitude shift which maximizes the cross correlation of histograms of occurence probability as a function of System III (1957.0) central meridian longitude. The weighted mean rotation period observed is 9 h 55 min 29.689 sec (standard deviation 0.005 sec), which is 0.022 sec less than the System III (1965) value. It is suggested that, if measurements are continued through the next maximum of Jovicentric earth declination, a secular drift in Jupiter's magnetic field may be observable.

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