Observations of energetic neutral oxygen by IMAGE/HENA and Geotail/EPIC A.T.Y. Lui, P.C. Brandt, D.G. Mitchell Energetic neutral oxygen emissions from two satellites, IMAGE and Geotail, are examined during a magnetic storm interval on 2001 November 24Ð25. These two satellite observations provide different viewing perspectives of the energetic neutral emissions from the Earth's magnetosphere. IMAGE has a high inclination orbit while Geotail has a low one. Overlapping energy range of energetic neutral oxygen occurs for HENA on IMAGE and EPIC on Geotail. Quantitative comparison of oxygen energy spectra during this storm period indicates that viewing perspective plays an important role in the total intensity measured. This study constitutes the first quantitative inter-spacecraft comparison of energetic neutral oxygen intensity. _______________ Geophysical Research Letters, 32 (13), L13104, doi:10.1029/2005GL022851, 2005