O+1 and N+1 are important ring current ions in great magnetic storms. We study ~10--210 keV/e O+1 and N+1 in dayside outer ring current (ORC) at ~9--15 RE using Geotail's EPIC/STICS ion spectrometer. We find: average N+1/O+1 (ΓN/O) varies by ~2 over a solar cycle, ~40% (~20%) at solar minimum (maximum); individual ΓN/O values range from ~0.15 (moderate solar maximum storm) to ~1 (18-hr solar minimum superquiet interval); and N+1 is third in importance after H+ and O+1 during two moderate storms (Dstmin ~ -80 nT, ~25% great storm intensity), one at minimum, one maximum. High-latitude topside ionospheric AE-D/MIMS ion composition data form a baseline reference used to argue that ORC ΓN/O variations generally reflect and may be partially explained by topside ionospheric density ΓN/O spatial variations.