Z-Mode Waves as the Source of Saturn Narrowband Radio Emissions

Details Z-Mode Waves as the Source of Saturn Narrowband Radio Emissions Z-Mode Waves as the Source of Saturn Narrowband Radio Emissions

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm32a..07y&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM32A-07

Physics

2756 Planetary Magnetospheres (5443, 5737, 6033), 2772 Plasma Waves And Instabilities (2471), 6964 Radio Wave Propagation, 6984 Waves In Plasma (7867)

Scientific paper

We report ~5 kHz narrowband Z-mode emissions observed by the Cassini Radio Plasma Wave Science (RPWS) instrument during high latitude perikrone passes. The narrowband emissions observed below the local electron cyclotron frequency (fce) are >20 dB more intense than the usual L-O mode narrowband emissions observed above local fce. Polarization measurements show that the narrowband emissions observed below fce are oppositely polarized to those above fce, which identifies the emissions below fce as Z-mode waves. We propose that the L-O mode narrowband emissions observed at ~5 kHz are mode converted from the Z-mode waves at a density gradient or density irregularity. The Z- mode to O-mode conversion via scattering off of density irregularities can also account for the direction finding results of ~5 kHz narrowband emissions that cannot be explained by the model in Ye et al. [2008], where narrowband emissions are first generated as electrostatic upper hybrid waves when the matching condition fUH = (n+1/2)fce is satisfied.

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