Voyager 1 plasma wave measurements of Saturn's inner magnetosphere are
reviewed with regard to interpretative aspects of the wave spectrum.
A comparison of the wave emission profile with the electron plasma fre
quency obtained from in situ measurements of the thermal ion density s
hows good agreement with various features in the wave data identified
as electrostatic modes and electromagnetic radio waves. Theoretical ca
lculations of the critical flux of super-thermal electrons able to gen
erate whistler-mode waves and electrostatic electron cyclotron harmoni
c waves through a loss-cone instability are presented. The comparison
of model results with electron measurements shows excellent agreement
lending support to the conclusion that a moderate perpendicular anisot
ropy in the hot electron distribution is present in the equatorial reg
ion of L = 5-8.