  During Cassini flyby of Saturn at a radial distance 6.18R_s (Saturn Radius),
a signal was detected from about 200 to 430 Hz that had the proper dispersion
characteristics to be a whistler. The frequency-time dispersion of the whistler
was found to be 81 Hz1/2s. Based on this dispersion constant, we determined,
from a travel time computation, that the whistler must have originated from
lightning in the northern hemisphere of Saturn. Using a simple centrifugal
potential model consisting of water group ions, and hydrogen ions we also
determine the fractional concentration and scale height that gave the best fit
to the observed dispersion.
