Observations showing that the low energy (≲4 is composed mainly of O+ and He+ ions during quiet times and the recovery of magnetic storms are presented. The data were obtained from the ion composition experiment on board the PROG-NOZ-7 satellite during several passes through the ring current region. For L≲3.5, the relative abundance of H+ was only a few percent of the ion energy density in the energy range of 0.2--17 keV. Although O+ normally dominates for L≲4, the relative contribution of He+ increases with decreasing L, and in one case became more abundant than O+ for L≲3. One example of a storm injection shows dominance by O+ ions (~82%) with H+ only giving a minor contribution (~15% to the density. These observations are consistent with inferences based on charge exchange, H+ being most rapidly lost and He+ being the most stable. |