Ion cyclotron waves in the Io plasma torus: polarization reversal of whistler mode noise. Revision. Progess report

Technical Report · Tue May 10 04:00:00 EDT 1983

OSTI ID:5811789

Gurnett, D A; Goertz, C K

Because of the presence of multiple ion species in the Io plasma torus whistler mode noise can be converted to ion cyclotron waves via a polarization reversal process at the local crossover frequency. Using whistler mode intensity measurements in the Jovian magnetosphere from Voyager 1 we estimate the pitch-angle diffusion rates that would occur if the noise is converted to ion cyclotron waves. Typical pitch-angle diffusion coefficients range from D sub alpha alpha approx. = 1/1000000 sec for protons resonating near the equator to D sub alpha alpha approx = 1/10000 sec for 10 keV 0(+) ions resonating at high latitudes. Although complete bounce averaged diffusion coefficients have not yet been computed, preliminary estimates indicate that the energetic ion precipitation caused by these wave may be able to account for the EUV auroral emissions at the foot of the torus field lines.

• Research Organization: Iowa Univ., Iowa City (USA). Dept. of Physics and Astronomy
• OSTI ID: 5811789
• Report Number(s): AD-A-129873/6
• Country of Publication: United States
• Language: English

Related Subjects

640107* -- Astrophysics & Cosmology-- Planetary Phenomena
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ATMOSPHERES
AURORAE
ELECTROMAGNETIC RADIATION
ELECTRON EMISSION
EMISSION
ION DENSITY
NOISE
PLANETARY ATMOSPHERES
PLANETARY MAGNETOSPHERES
PLASMA WAVES
POLARIZATION
RADIATIONS
RADIO NOISE
RADIOWAVE RADIATION
SATELLITES
WHISTLERS