Theory and observations of electromagnetic ion cyclotron waves in Saturn's inner magnetosphere

Details Theory and observations of electromagnetic ion cyclotron waves in Saturn's inner magnetosphere Theory and observations of electromagnetic ion cyclotron waves in Saturn's inner magnetosphere

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.9345b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A6, p. 9345-9350.

Physics

12

Electromagnetic Radiation, Ion Cyclotron Radiation, Planetary Magnetospheres, Plasma Waves, Satellite Observation, Saturn Atmosphere, Planetary Magnetic Fields, Voyager 1 Spacecraft, Saturn, Magnetosphere, Theoretical Studies, Electromagnetic Properties, Ions, Cyclotron Waves, Spacecraft Observations, Voyager 1 Mission, Magnetic Field, Excitation, Oxygen, Pickup, Spectra, Hypotheses, Thermal Properties, Anisotropy, Pioneer 11 Mission, Satellites, Dione, Tethys, Plasma Torus, Waves, Particles, Interaction, C

Scientific paper

High-resolution Voyager 1 magnetic field observations of Saturn's inner magnetosphere are examined for the presence of ULF waves. Quasi-circular left-hand polarized transverse oscillations are found in the near-equatorial region of 5-7 Rs with a wave period about 10 s and peak amplitude of about 2 nT. The wave is identified as the electromagnetic oxygen cyclotron mode occurring at a frequency just below the O(+) ion cyclotron frequency. A theoretical model of wave excitation based on gyroresonant coupling through a temperature anisotropy of O(+) pickup ions is developed which accounts for the principal features of the wave spectrum. It is hypothesized that wave-particle interactions provide a level of scattering commensurate with the weak pitch angle diffusion regime but nonetheless one that regulates and maintains a constant thermal anisotropy of ions along the magnetic field. Arguments are also presented that O(+) was the dominant thermal ion of the Dione-Tethys plasma torus at the time of the Pioneer 11 encounter the year previous to the Voyager 1 measurements.

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