Computer Science – Sound
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996natur.379..323p&link_type=abstract
Nature, Volume 379, Issue 6563, pp. 323-325 (1996).
Computer Science
Sound
62
Scientific paper
THE electrodynamic interaction between Jupiter and the closest of its large moons, Io, is unique in the Solar system. Io's volcanoes eject a considerable amount of material into the inner jovian system (>1 tonne per second), much of it in the form of ions1; the motion of Io through Jupiter's powerful magnetic field in turn generates a million-ampere current2 between the charged near-Io environment and the planet's ionosphere. This current is presumably carried by Alfvén waves3, the electromagnetic equivalent of sound waves. Here we present far-ultraviolet observations of the atmospheric footprint of this current, which demonstrate that most of the energy is dissipated rapidly when the waves first encounter Jupiter's ionosphere; the position of the footprint varies with time. We see no evidence for the multiple ionospheric interactions that have been proposed to explain the structure of the radio emissions associated with these waves4.
Ip Wing
Miller Steven
Prangé Renee
Rego Daniel
Southwood David
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