1/f noise under conditions of interaction between phase transitions

Vibrational modes of combustion under conditions of combustible liquid boil ing before the reaction front are investigated experimentally. Fluctuations are observed with the spectral density inversely proportional to frequency (1/f noise). This phenomenon is associated with the intersection and inter action of nonequilibrium phase transitions. A mathematical model is suggest ed of the emergence of fluctuations with a 1/f spectrum under conditions of interaction between subcritical and supercritical phase transitions in a d istributed system.