Figure 1. A four-minute overview of FAST data from orbit 1697 on January 25, 1997, showing electron energy, ion pitch angle (all species), H⁺ energy, He⁺ energy, O⁺ energy, average energy per ion for each species, the ion hybrid frequency, ELF electric field, ELF magnetic field, and band-integrated wave energy density at 60–120 Hz. Lines on the frequency spectrograms indicate the local proton gyrofrequency. The ELF B spectra have been flattened by f² to reduce the dynamic range needed to show the spectrogram.