Example of a discontinuity automatically detected by SBM1 mode on-board on December 30, 2020, one minute time interval around 06:11:37.74 UT. a: MAG magnetic field (blue line) and electron density (in black) from RPW; b: SCM magnetic fluctuations δB for [5, 10] Hz frequency range in the RTN frame, two vertical dotted lines indicate a localized wave emission; c: density fluctuations within the same frequency range, normalized to its mean δN_e/N_e0 within a 6 s time interval before the discontinuity; d: normalized magnetic fluctuations δB/B₀ in the minimum variance frame for the same time interval as (c); e: polarization of the wave packet, diamond indicates the starting time point −3.8 s.