Examples of ion acoustic waves detected in near-Venus space. Subplots a, c and e show the dV12 component of the on board AC electric field spectra. Subplots b, d and f show the on board spectra from the high-frequency window of the SCM data, validating that the waves shown in subplots a, c and e are electrostatic. Each row shows a different wave with the subtitle of each row giving the locations of PSP in VSO at the start and end of the plotted timeframes. The top and middle rows show waves detected during VGA1 and the bottom row shows a wave from VGA3. The two pink bars on the y-axes of the left subplots illustrate the frequency range of the 730 Hz and 5.4 kHz channels of the PVO OEFD instrument.