Physics
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufm.p31a0192s&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #P31A-0192
Physics
5704 Atmospheres (0343, 1060), 5706 Aurorae, 5714 Gravitational Fields (1221), 5734 Magnetic Fields And Magnetism, 6275 Saturn
Scientific paper
It is well known that the SKR period has changed over time, increasing by ~0.5 percent per year during the Cassini epoch. This impacts many aspects of magnetospheric science but also poses a problem both for the elucidation of the internal field of Saturn and the rotation rate of the interior. Long term monitoring of the continuous radio signals has allowed derivation of a formula governing the evolution of the phase and thereby the change of period during the Cassini epoch up to August 2006 (Kurth et al., 2007). The radio data have the virtue of being nearly continuous but are not well suited for determining an instantaneous frequency and phase. We show evidence from the magnetometer data measured in situ by the Cassini spacecraft while the spacecraft is within the cam region (L shells less than 11 - 17) of fairly stable phase in the oscillations and thereby refine the estimates of the time varying period. We propose a mechanism whereby the magnetometer signal and the radio signal are synchronized based on the proposed phase model.
Dougherty Michele
Galland Kivelson Margaret
Southwood David J.
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