Observations of whistler waves activities with Solar Orbiter on 2021/08/15 (left) and 2021/10/08 (right). Panels a–e and i–m: Spectrograms of several wave parameters calculated from CWF with: Panels a and i: Power spectral density. Panels b and j: Planarity. Panels c and k: Ellipticity. Panels d and l: Propagation angle. Panels e and m: φS_X. Panels f and n: X components of the background magnetic field. Panels g and o: Velocity distribution functions (summed over energies between 100 and 1000 eV and over all elevations) as a function of time and azimuth angle of EAS 1 with the azimuth of the background magnetic field in black (in the EAS 1 reference frame). Panels h and p: Pitch angle distribution (summed over energies between 100 and 1000 eV) using EAS 1 and EAS 2 data.