First evidence for a Europa plasma torus

Details First evidence for a Europa plasma torus First evidence for a Europa plasma torus

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.8081i&link_type=abstract

Journal of Geophysical Research, vol. 87, Oct. 1, 1982, p. 8081-8090.

Physics

22

Cold Plasmas, Europa, Jupiter Satellites, Magnetospheric Ion Density, Satellite Atmospheres, Toroidal Plasmas, Io, Ion Sources, Pioneer 10 Space Probe, Plasma Density, Radial Flow, Sulfur, Toruses, Voyager 2 Spacecraft

Scientific paper

The evidence from the Pioneer 10 plasma analyzer that plasma derived from Europa was present in the Jovian magnetosphere in December 1973 is summarized. Plasma detected between 1900 UT and 2100 UT on December 3, 1973, reveals a number of significant phenomena near the expected position of Europa's L shell. Mass addition to the magnetospheric plasma is indicated by a local increase in density apparently superimposed on the density gradient of Iogenic plasma. This increase in plasma density is unlike any phenomenon observed when the spacecraft is near a lunar L shell. The density shows fluctuations that make possible an estimate of the net outflow speed of magnetospheric ions per Jovian rotation. A radial flow speed in 1973 of 0.37 km/s from the Pioneer data is made, together with an estimate of 1 km/s in 1979 from Voyager 2 data, thus indicating a significant change.

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