Scattered Signal Observations During Cassini Radio Occultations by Saturn's Rings

Details Scattered Signal Observations During Cassini Radio Occultations by Saturn's Rings Scattered Signal Observations During Cassini Radio Occultations by Saturn's Rings

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufm.p33b0247t&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #P33B-0247

Physics

6250 Moon (1221)

Scientific paper

Eight Cassini radio occultations of Saturn's rings were conducted between May 3 and September 5, 2005. During any given occultation, Cassini transmits through the rings three coherent sinusoidal radio signals of wavelength 0.94, 3.6, and 13 cm (Ka-, X-, and S-band, respectively). Spectral analysis of the signals received at the NASA Deep Space Network (DSN) reveals two distinct signal components. The first component is the direct signal, the remnant of the incident sinusoid reduced in amplitude and shifted in phase. The second component is the near-forward scattered signal, which is a frequency-broadened by the Doppler shift introduced by the relative motion of the spacecraft and ring particles. The scattered component is clearly detectable at all three observation wavelengths and for most ring features, with the exception of the optically thick subregions in Ring B where the radio signals were essentially blocked. This is the first time ever near-forward scattered signals are observed at three radio bands simultaneously. We present observed spectrograms of the Ka/X/S-band signals across the full ring system and characterize their relationship to observed ring structure. We also present results of preliminary analysis of the implications of the observations for the particle size distribution and microstructure of selected ring features.

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