Early Observations of Saturn Kilometric Radiation by Cassini

Details Early Observations of Saturn Kilometric Radiation by Cassini Early Observations of Saturn Kilometric Radiation by Cassini

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm11d..07k&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM11D-07

Astronomy and Astrophysics

Astronomy

2756 Planetary Magnetospheres (5443, 5737, 6030), 2784 Solar Wind/Magnetosphere Interactions, 5737 Magnetospheres (2756), 6954 Radio Astronomy

Scientific paper

One of the primary objectives of the Cassini radio and plasma wave science investigation at Saturn is the study of Saturn kilometric radio emissions (SKR). Based primarily on Voyager observations, these emissions are believed to be analogous to auroral kilometric radiation at Earth, generated via the cyclotron maser instability near the electron cyclotron frequency on field lines threading Saturn's aurora. Beginning in early 2002, Cassini has observed Saturn's most prominent radio emission on numerous occasions with signal to noise ratios exceeding 10 dB, even though the spacecraft is still more than two astronomical units from Saturn. One specific objective involving SKR is to develop the relationship between the timing and intensity of the radio emissions as a function of solar wind input; strong correlations with various solar wind parameters are already known on the basis of Voyager studies. A second objective is to measure spectral and temporal variations in the SKR emissions at high resolution. The observations acquired by Cassini to date already allow such studies to begin. Simple ballistic projections of high density regions in the solar wind observed at 1 AU have been used successfully to predict the intensification, hence detection, of SKR by Cassini. Also the first high-resolution frequency-time spectrograms of SKR have been acquired; these show a wealth of spectral and temporal structure one would expect on the basis of observations of terrestrial auroral kilometric radiation.

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