Saturn's magnetosphere - Observations of ion cyclotron waves near the Dione L shell

Details Saturn's magnetosphere - Observations of ion cyclotron waves near the Dione L shell Saturn's magnetosphere - Observations of ion cyclotron waves near the Dione L shell

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.7831s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Oct. 1, 1983, p. 7831-7836.

Physics

29

Dione, Ion Cyclotron Radiation, Planetary Magnetospheres, Plasma Waves, Saturn Atmosphere, Space Plasmas, Pioneer 11 Space Probe, Polarization (Waves), Power Spectra, Saturn, Magnetosphere, Observations, Ions, Waves, Satellites, Dione, Pioneer 11, Vector Helium Magnetometer, Vhm, Features, Characteristics, Period, Amplitude, Plasma Analyzer, Density, Sputtering, Source, Torus, Temperature, Velocity, Hypotheses, Oxygen, Hydrogen, Anisotropy, Precipitation, Auroras, Analysis, Physical Properties

Scientific paper

The mode of propagation and generational mechanism of quasi-periodic waves shown to be present near the Dione L shell by high time resolution measurements made with the Pioneer 11 vector helium magnetometer are investigated. The waves have a characteristic period of 18 s, well below the proton gyroperiod, and a typical amplitude of 5 nT. Ion cyclotron resonance of the waves with the dominant ions appears capable of generating the waves. Theoretical arguments based on the growth rates of the waves suggest that O(2+) is more likely to be responsible than O(+), but that a resonance involving H(+) ions with energies of a few keV cannot be excluded. Pitch angle scattering of heavy ions by the waves should cause precipitation with the possible production of an aurora near 67 deg latitude.

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