Other
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000ssrv...91..197s&link_type=abstract
Space Science Reviews, v. 91, Issue 1/2, p. 197-242 (2000).
Other
75
Scientific paper
The Extreme Ultraviolet Imager (EUV) of the IMAGE Mission will study the distribution of He^+ in Earth's plasmasphere by detecting its resonantly-scattered emission at 30.4 nm. It will record the structure and dynamics of the cold plasma in Earth's plasmasphere on a global scale. The 30.4-nm feature is relatively easy to measure because it is the brightest ion emission from the plasmasphere, it is spectrally isolated, and the background at that wavelength is negligible. Measurements are easy to interpret because the plasmaspheric He^+ emission is optically thin, so its brightness is directly proportional to the He^+ column abundance. Effective imaging of the plasmaspheric He^+ requires global `snapshots' in which the high apogee and the wide field of view of EUV provide in a single exposure a map of the entire plasmasphere. EUV consists of three identical sensor heads, each having a field of view 30 deg in diameter. These sensors are tilted relative to one another to cover a fan-shaped field of 84 degx30 deg, which is swept across the plasmasphere by the spin of the satellite. EUV's spatial resolution is 0.6 deg or ~0.1 R_E in the equatorial plane seen from apogee. The sensitivity is 1.9 count s^-1 Rayleigh^-1, sufficient to map the position of the plasmapause with a time resolution of 10 min.
Allred DAVID D.
Broadfoot Lyle A.
Chen Jiahua
Curtis Christina
Gallagher Dennis L.
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