Measurements of heavy ions in the low-altitude outer zone are discussed in this paper. The data were acquired with a heavy-ion sensor aboard the S3-2 satellite in the time period between December 24, 1975, and March 3, 1976. At L=3.25, 0.35?B?0.25, and E>250 keV/nucleon, mirroring fluxes of 370 cm-1 s-1 sr-1 He ions and 0.25 cm-2 s-1 sr-1 CNO ions were observed. Thus the CNO/He ratio was ?6.8¿10-5. Equatorial measurements (Spjeldvik and Fritz, 1978c; Hovestadt et al., 1978) gave a much larger He/CNO ratio; clearly, magnetospheric processes strongly discriminate against populating the low-altitude regions with ions of increasing mass in the energy range of hundreds of keV. In addition, a comparison of the S3-2 data with those from Injun 5 acquired in January 1969 in the same region of the magnetosphere indicated that the low-altitude CNO/He ratio is strongly time dependent.