Electromagnetic Ion Cyclotron Ring Instability in the Io Plasma Torus

Details Electromagnetic Ion Cyclotron Ring Instability in the Io Plasma Torus Electromagnetic Ion Cyclotron Ring Instability in the Io Plasma Torus

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusm.p41c..02c&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #P41C-02

Physics

6219 Io, 7829 Kinetic Waves And Instabilities, 2152 Pickup Ions, 2732 Magnetosphere Interactions With Satellites And Rings, 2772 Plasma Waves And Instabilities (2471)

Scientific paper

Ion cyclotron waves generated by temperature anisotropy instability have been studied previously using linear theory and self-consistent simulation methods for the Earth's magnetosphere and solar wind. These studies mainly focus on protons with bimaxwellian velocity distributions. At Io, populations of heavy ions are mass loaded from the moon's atmosphere into the surrounding plasma torus, forming anisotropic "ring"-type distributions in velocity space with T⊥ > T∥. Using warm plasma linear dispersion analysis and one dimensional hybrid simulation, we study the behavior of this instability under low-beta plasma conditions like that in the Io plasma torus and compare the simulated behavior of the instability if it is driven by the anisotropy of a ring velocity distribution or of an equivalent bimaxwellian velocity distribution. We find that the simulations agree with the predictions of linear theory in terms of the generated wave frequencies and wavenumbers and that the wave growth rates are the same for the bimaxwellian and ring velocity distributions. However, the growing wave amplitudes are higher for the ring velocity distribution, indicating the ring has more free energy available for wave growth.

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