The centrifugal flute instability and the generation of Saturnian kilometric radiation

Details The centrifugal flute instability and the generation of Saturnian kilometric radiation The centrifugal flute instability and the generation of Saturnian kilometric radiation

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9110989c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Oct. 1, 1986, p. 10989-10994. NASA-supported research.

Physics

18

Kilometric Waves, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Planetary Radiation, Saturn (Planet), Hot Electrons, Plasma Layers, Radiation Sources, Solar Wind

Scientific paper

The authors show that the source region for Saturnian kilometric radiation (SKR) which originates in the high latitude near-noon dayside ionosphere can be mapped via the Saturn magnetic field to the outer edge of the dayside equatorial plasmasheet. The plasmasheet is known to be unstable at this boundary due to the outward centrifugal forces generated by the heavily mass-loaded equatorial Saturnian magnetosphere. Also previous work has shown that Voyager 1 observations of MHD waves near the plasmasheet are consistent with their being driven by the centrifugal flute instability. The resulting field-aligned MHD waves at higher latitudes can trap and accelerate electrons. For the plasma environment measured by Voyager, field-aligned accelerated electrons up to energies of several keV are expected to be deposited into the SKR ionospheric source region. These electrons constitute the free energy source for the observed SKR.

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