Physics
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.3745w&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 1, 1990, p. 3745-3754.
Physics
16
Io, Magnetic Field Configurations, Magnetohydrodynamic Waves, Planetary Magnetic Fields, Decametric Waves, Ray Tracing, Wave Propagation, Wentzel-Kramer-Brillouin Method, Jupiter, Satellites, Io, Alfven Waves, Wakes, Models, Evolution, Magnetic Fields, Torus, Density, Distribution, Patterns, Downstream, Periodicity, Structure, Calculations, Frequencies, Perturbations, Latitude, Periods, Decimeter Waves, Storms
Scientific paper
The evolution of Io's Alfven waves is modeled in a realistic magnetic field and torus density distribution. This is performed by calculating the normal modes of the field lines disturbed by Io and synthesizing the waves near Io from a complex sum over the eigenmodes. The wave pattern produced downstream from the satellite exhibits periodic structure over a range of scales. In terms of the Jovian longitude of a stationary observer, large-scale structure (greater than 60 deg), small-scale structure (smaller than 6 deg), and intermediate periods are expected. These are close to observed intervals in decametric (DAM) emissions, such as the length of a DAM storm, bunching of arcs within a storm, and individual arc separation.
Smith Robert P.
Wright Andrew. N.
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