The sound level is certainly intense from helicopter blades... not ultrasonic, but sonoluminescence does not demand ultrasound.
Yellow is a characteristic color of salinity and many sandy deserts are highly saline. Instead of sand, per se, the emission could be caused by cavitation in saline air. -----Original Message----- From: Steven Krivit cavitation??? >Dust impact? Glow discharge? Dust contaminates the N2O2 plasma? > Bright yellow glow from helicopter rotors > http://www.michaelyon-online.com/the-kopp-etchells-effect.htm > >(from http://sprott.physics.wisc.edu/pickover/pc/realitycarnival.html) > > >(((((((((((((((((( ( ( ( ( (O) ) ) ) ) ))))))))))))))))))) >William J. Beaty SCIENCE HOBBYIST website >billb at amasci com http://amasci.com >EE/programmer/sci-exhibits amateur science, hobby projects, sci fair >Seattle, WA 206-762-3818 unusual phenomena, tesla coils, weird sci
