Plasma wave activity throughout the magnetosheath during the inbound portion of VGA4, which includes Langmuir, ion acoustic and whistler−mode waves. Subplot a shows the on board AC electric field spectra across the V12 voltage probe pair, subplot b shows the high frequency window of the SCM magnetic field data, c shows the FFT of the total differential voltage timeseries data, and subplot d shows the FFT of the total SCM timeseries data.