According to the recent revision of the theory of thermal radiation, thermalblack-body radiation has an induced origin. We show that in single-bubblesonoluminescence thermal radiation is emitted by a spherical resonator,coincident with the sonoluminescing bubble itself, instead of the ensemble ofelementary resonators emitting thermal black-body radiation in the case of opengaseous media. For a given wavelength, the diameter of the resonator is fixed,and this explains the very high constancy in phase of light flashes from thesonoluminesing bubble, which is better than the constancy of period of adriving acoustic wave.
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