Fig. 10

Van Allen Probe A observations of a the dynamic power spectrum of the magnetic field variations in the azimuthal component with selected peak frequency indicated by black dots, b the selected peak frequency, c mass density at the satellite position, d electron density at the satellite position, and e average plasma mass, during 04:00–11:30 UT on 12 September 2017. Expanded plots during 04:10–05:10 UT of f electron density at the satellite position, g average plasma mass, and h, i the dynamic power spectra of wave amplitudes in the directions perpendicular/parallel to the local magnetic field