Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p11b1259s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P11B-1259
Physics
5734 Magnetic Fields And Magnetism, 5737 Magnetospheres (2756), 5794 Instruments And Techniques, 6275 Saturn
Scientific paper
Magnetic field measurements during the first 15 Cassini orbits inside 10 Saturn radii yield spectra containing a central peak, Saturn's periodicity, and sidebands with difference frequencies corresponding to the orbital period. The sidebands are interpreted as a phase modulation of the periodicity caused by the periodic changes in longitude and distance from Saturn. The sideband amplitudes are used to determine a single parameter characterizing the modulation. This interpretation is consistent with outward propagation of a wave from an inner source rotating differentially with respect to the magnetosphere as proposed in the 'Cam' model. The modulation parameter coincides with a wave speed of 30 km/sec. This speed agrees with that derived by Cowley et al. (2006) who used the Cam model to reproduce the observed phase shift during a single orbit. Future studies of the periodicity and the wave properties should benefit from analyses based on this phase modulation.
Dougherty Michele
Smith Edward
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