  We elucidate effects of solar density fluctuations on neutrino propagation
through the Sun. Using data from the recent solar neutrino and KamLAND
experiments we provide stringent limits on solar density fluctuations. It is
shown that the neutrino data constrains solar density fluctuations to be less
than beta = 0.05 at the 70 % confidence level, where beta is the fractional
fluctuation around the value given by the Standard Solar Model. We find that
the best fit to the combined solar neutrino and KamLAND data is given by beta =
0.
