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GEOPHYSICAL RESEARCH LETTERS, VOL. 32, L13104, doi:10.1029/2005GL022851, 2005

Observations of energetic neutral oxygen by IMAGE/HENA and Geotail/EPIC

A. T. Y. Lui

Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA


P. C. Brandt

Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA


D. G. Mitchell

Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland, USA


Abstract

Energetic neutral oxygen emissions from two satellites, IMAGE and Geotail, are examined during a magnetic storm interval on 2001 November 24–25. 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.

Received 28 February 2005; accepted 9 June 2005; published 8 July 2005.

Index Terms: 2730 Magnetospheric Physics: Magnetosphere: inner; 2778 Magnetospheric Physics: Ring current; 2788 Magnetospheric Physics: Magnetic storms and substorms (7954).

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Citation: Lui, A. T. Y., P. C. Brandt, and D. G. Mitchell (2005), Observations of energetic neutral oxygen by IMAGE/HENA and Geotail/EPIC, Geophys. Res. Lett., 32, L13104, doi:10.1029/2005GL022851.