Source mechanism of Saturn drifting bursts

Details Source mechanism of Saturn drifting bursts Source mechanism of Saturn drifting bursts

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm11a1994t&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM11A-1994

Physics

[2756] Magnetospheric Physics / Planetary Magnetospheres, [6964] Radio Science / Radio Wave Propagation

Scientific paper

Saturn drifting bursts (SDBs) are a new class of Kronian radio emission detected by the Cassini spacecraft in the lower kHz frequency range (< 50 kHz). Their bursty nature and slow drift in the time-frequency spectrogram clearly distinguish them from other types of radio emissions which are observed around Saturn. A statistical analysis of more than 5 years of data (mid 2004 - 2010) constrains source regions to the middle magnetosphere (6 - 15 Rs; 1 Rs = 60268 km). For this region, we show observational evidence of mode conversion, i.e. a conversion from electrostatic upper hybrid resonance oscillations to the electromagnetic O-mode and/or Z-mode. Mode conversion is suggested to be the source for SDBs. Furthermore, the special beaming pattern of the radiation is investigated with ray-tracing studies in the frame of the cold plasma theory.

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