An image formed in 5 minutes by energetic neutral atoms (ENA) emitted by charge exchange with ring-current energetic ions (~50 keV) has been constructed and analyzed from ISEE 1 measurements at a radial distance of 2.6 Re during the main phase (Dst=-241 nT) of the geomagnetic storm of September 29, 1978. Comparison with simulated images calculated from a simple model of the global ring-current ion distribution implies a strong (>20:1) midnight/noon ion intensity asymmetry. Estimated ion fluxes in the midnight meridian (3.0<r<5.0Re) are 2.5¿106 (cm2 s sr keV)1 for 30 keV H+ (if H-atoms dominated the ISEE 1 ENA fluxes) or 1.0¿106 (cm2 s sr keV)-1 for 70 keV O+ (if O:atoms dominated). ENA fluxes (whether H or O) from the brightest areas of the image exceed 103 (cm2 s sr keV)-1. ¿American Geophysical Union 1987