Comprehensive measurements of the angular distributions and energy spectra of electron intensities within the energy range 50 eV ?E?15 keV with electrostatic analyzer arrays on board the low-altitude satellite Injun 5 are reported for the postmidnight sector of the auroral zones during the high-intensity events accompanying magnetic substorms. Precipitation features on closed terrestrial field lines well equatorward of the trapping boundary for energetic electrons with E>45 keV are examined. No evidence of maxima in the differential energy spectra or of strongly field-aligned currents, j∥>j⊥, which are indicative of quasi-static electric fields aligned parallel to the geomagnetic field, was found in our series of measurements within the above energy range. Precipitation of low-energy electron intensities fluctuated on time scales of >2 s as viewed at the satellite position. This precipitation was characterized by isotropy for all pitch angles outside the atmospheric backscatter cone. Maximum precipitated energy fluxes were several ergs (cm2 s sr)-1. This region of electron precipitation is associated with the diffuse aurora and with pulsating aurora in the postmidnight sector. Similar variations of the energetic electron intensities with E>45 keV were observed in the regions of fluctuating energy fluxes of low-energy electrons associated with auroral luminosity. In general, the increases of energetic electron intensities were not coincident with those of the principal energy fluxes into the atmosphere, except when the average electron energy for the energy fluxes was unusually high, i.e., in the 10-keV range. Precipitation of electron intensities within the energy ranges 50 eV to 15 keV and >45 keV is consistent with strong pitch angle diffusion of electron intensities near or at the magnetic equator by high-frequency wave turbulence, the effectiveness of which is modulated by perturbations attributable to micropulsations to yield the rapid fluctuations encountered over the postmidnight auroral zone.