DMSP F6 and F7 satellite observations. It is shown that in the dusk sector the positions of electron and ion pre-
cipitation boundaries are nearly coincident for all levels of magnetic activity; however the latitudinal distribu-
tion of energy fluxes indicates that the positions of electron and ion precipitation maxima are spatially sepa-
rated. Maximum energy fluxes of ions is observed at the equatorial precipitation boundary, while those of elec-
trons at the poleward one. In the dawn sector, the electron precipitation region is 3–4 wider than that of ions.
The isotropy boundary in the dusk sector is located in the region of diffuse precipitation (DAZ) near its pole-
ward boundary for all levels of magnetic activity, while in the dawn sector it falls in the region of structured
precipitations (AOP). Electron precipitations are dominating in the dawn sector. Here in the region of diffuse
precipitation (DAZ), the ion energy fluxes Fi make less than 5% as compared to the electron energy flux Fe. In
the region of structured precipitations (AOP), the portion of Fi decreases with increasing magnetic activity from
~10–20% for AL
–100 nT to <5% for AL –1000 nT. As for the dusk sector, in the AOP region, electron pre-cipitations are dominating as well, while in the DAZ region the ion energy fluxes are significant. In the 1500–
1800 MLT sector, the ratio Fi/Fe increases from ~0.7 to ~3.0 with AL changing from –100 nT to –1000 nT.