Rosetta data obtained on 3 August 2015, during a period with frequent diamagnetic cavity encounters. The grey boxes and vertical lines on all panels mark these diamagnetic cavity traversals. (a) Passive spectrum obtained by the RPC-MIP instrument. (b) Magnitude of the magnetic field |B| measured by RPC-MAG. (c) Magnetic field components B_x (blue), B_y (green), and B_z (red). (d) Plasma density obtained by RPC-MIP and RPC-LAP (see Sect. 2.1). (e) Ion energy spectrogram obtained by RPC-ICA. The colour coded quantity lg (Γ_ICA) is the logarithm of the differential particle flux in units of cm⁻² s⁻¹ sr⁻¹ eV⁻¹ summed over all azimuth angles.