Relationship between the Jovian magnetospheric plasma density and Io torus emission

Details Relationship between the Jovian magnetospheric plasma density and Io torus emission Relationship between the Jovian magnetospheric plasma density and Io torus emission

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3211101n&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 11, CiteID L11101

Physics

1

Magnetospheric Physics: Planetary Magnetospheres (5443, 5737, 6033), Magnetospheric Physics: Magnetosphere Interactions With Satellites And Rings, Planetary Sciences: Fluid Planets: Tori And Exospheres, Planetary Sciences: Fluid Planets: Magnetospheres (2756)

Scientific paper

Ground-based observations of [SII] 673.1 nm emissions from the Io plasma torus (IPT) showed a year-to-year decrease between 1997 and 2000. This phenomenon suggests that the electron and ion densities in the IPT decreased during the period, since an excitation source of the [SII] 673.1 nm emissions is an electron impact. Using Galileo plasma wave subsystem (PWS) data, local electron density in the magnetosphere (30-60 RJ) was investigated. The electron density in the middle and outer magnetosphere also showed a long-term decrease between 1997 and 2000. This concurrent long-term variation in the magnetospheric electron density with the IPT emissions verifies that the IPT gives influence to the magnetospheric plasma environment, as has been suggested since the Voyager era. Relative amplitudes of variations in the [SII] intensity and electron density were, however, different from each other.

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