Theory and observations of electrostatic ion waves in the cold Io torus

Details Theory and observations of electrostatic ion waves in the cold Io torus Theory and observations of electrostatic ion waves in the cold Io torus

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.6443b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, May 1, 1990, p. 6443-6450.

Physics

8

Electrostatic Waves, Io, Planetary Magnetospheres, Radiation Belts, Cyclotron Radiation, Extremely Low Radio Frequencies, Heavy Ions, Jupiter (Planet), Plasma Waves, Voyager 1 Spacecraft, Jupiter, Satellites, Io, Theoretical Studies, Electrostatic Effects, Ions, Waves, Plasma Torus, Magnetosphere, Spacecraft Observations, Voyager 1 Mission, Calculations, Analysis, Kinetics, Distribution, Pickup, Protons

Scientific paper

A study of the ELF plasma wave environment of the cold Io torus in Jupiter's magnetosphere is made. Voyager 1 data are presented which show three distinct types of electrostatic ion waves occurring there: the Buchsbaum ion-ion mode just below the proton cyclotron frequency f(cp), hydrogen Bernstein modes at (n + 1/2) f(cp), and lower hybrid waves near f(LHR). The presence of these waves at their characteristic frequencies is consistent with a predominantly heavy ion plasma composed of singly ionized sulfur and oxygen ions along with a small admixture of protons. The hydrogen Bernstein modes are tightly confined to the magnetic equator, occurring within + or - 4 deg of it, while the Buchsbaum mode is localized to the dense heavy ion plasma of the cold torus near the centrifugal equator. A general theory for excitation of the waves based on the ion pickup process is developed.

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