Equatorial electron density measurements in Saturn’s inner magnetosphere
Résumé
Upper hybrid resonance emissions detected by the
Radio and Plasma Wave Science (RPWS) instrument on the
Cassini spacecraft are used to obtain electron densities on
five equatorial orbits of Saturn at radial distances ranging
from 3 to 9 saturnian radii (RS). The electron density profiles
for these orbits show a highly repeatable radial dependence
beyond 5 RS, decreasing with increasing radial distance
approximately as (1/R)3.63. Inside 5 RS, the electron density
profiles are highly variable. We show that these radial
variations are consistent with a centrifugally-driven
outward transport of plasma from a source inside 5 RS.
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