Context plasma and magnetic field conditions for the studied interval of near-f_ce waves. Panel a: spectrogram of the differential voltage signals (V₁₂ + V₃₄). The dashed white line indicates the local electron cyclotron frequency. The dashed vertical black lines indicate the studied burst interval. Panels b,c: ambient magnetic field vector and plasma flow velocity in the spacecraft frame in spacecraft coordinates. Panel d: electron density determined by quasi-thermal noise measurements. Panel e: burst capture electric field time series in spacecraft coordinates.