Correlating east-west asymmetries in the Jovian magnetosphere and the Io sodium cloud

Details Correlating east-west asymmetries in the Jovian magnetosphere and the Io sodium cloud Correlating east-west asymmetries in the Jovian magnetosphere and the Io sodium cloud

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987georl..14..973s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 14, Sept. 1987, p. 973-976.

Physics

15

Jupiter Atmosphere, Planetary Magnetospheres, Plasma Clouds, Plasma Density, Plasma Temperature, Sodium, Toroidal Plasmas, Asymmetry, Electron Energy, Extreme Ultraviolet Radiation, Io, Jupiter, Satellites, Io, Symmetry, Magnetosphere, Sodium, Clouds, Ions, Intensity, Ultraviolet, Wavelengths, Emissions, Electric Field, Density, Optical Properties, Plasma Torus, Electrons, Temperature, Time Scale

Scientific paper

Three east-west intensity asymmetries in the Jupiter system that would appear to an earth observer in optical S+, extreme ultraviolet S++ and optical Na emissions are reviewed. The three asymmetries imply that some combination of the plasma torus number densities and electron temperature is, on the long-term average, larger west of Jupiter than east of Jupiter. A small east-to-west electric field, previously proposed to explain the ion intensity asymmetries, is also shown to provide a natural explanation for the sodium intensity asymmetry. A long-term average east-to-west electric field of about 3 mV/m and a corresponding west-to-east offset of about 0.16 Jupiter radii for the plasma torus at Io's orbital distance are implied. On a shorter time scale, the east-west electric field appears to be time variable and may be readily monitored from earth by observations of the sodium cloud.

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