Radial pro®les are reported of average and rms temperature in a propane ¯ame for the ®rst, second, and third acoustic modes at four different axial positions above the burner in a Rijke-tube combustor. Selected plots of the power spectral density (PSD) of temperature ¯uctuations are also reported. These radial pro®les are then compared to similar ones made in the same ¯ame, but in the absence of the acoustic ®eld. Visual observations and photographs of the ¯ame showed a remarkable change in ¯ame height and structure with the onset of acoustic oscillations. This reduction in ¯ame length, caused by the enhanced mixing due to the acoustic velocity ¯uctuations, gave rise to higher and lower average and rms temperatures near or well above the burner, respectively. In general, the PSD plots had a broad frequency content. The general trend was a decrease in magnitude with an increase in frequency. All cases presented broad-band peaks at around 5 Hz related to the ¯ame ¯ickering phenomenon. Preferred frequencies were observed in the oscillating PSD plots related to the fundamental frequency as well as subharmonics in the tube.