Calculation of IMAGE/MENA geometric factors and conversion of images to units of integral and differential flux | Zendy

M. G. Henderson | Zendy; M. F. Thomsen | Zendy; R. M. Skoug | Zendy; M. H. Denton | Zendy; R. W. Harper | Zendy; H. O. Funsten | Zendy; C. J. Pollock | Zendy

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Calculation of IMAGE/MENA geometric factors and conversion of images to units of integral and differential flux

Author(s) -

M. G. Henderson,

M. F. Thomsen,

R. M. Skoug,

M. H. Denton,

R. W. Harper,

H. O. Funsten,

C. J. Pollock

Publication year - 2005

Publication title -

review of scientific instruments

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.605

H-Index - 165

eISSN - 1089-7623

pISSN - 0034-6748

DOI - 10.1063/1.1884190

Subject(s) - physics , flux (metallurgy) , angular resolution (graph drawing) , spacecraft , range (aeronautics) , differential (mechanical device) , energy (signal processing) , image (mathematics) , matching (statistics) , computer science , computational physics , computer vision , aerospace engineering , mathematics , statistics , materials science , combinatorics , astronomy , quantum mechanics , engineering , metallurgy , thermodynamics

The Medium Energy Neutral Atom (MENA) instrument flown on the NASA IMAGE spacecraft is a time-of-flight neutral particle imager designed to image energetic neutral atom emissions from the Earth’s inner magnetosphere over an energy per mass range of 1–60keV∕amu. Images are generated by combining data from three separate heads and have a nominal angular resolution of 4°×4°. Here, we present a first-principles calculation of the geometric factors for each of the start-byte/stop-byte combinations for each of the three heads in the IMAGE/MENA instrument based on a detailed understanding of the its physical construction. The geometric factors are used to compute combined integral flux images and it is demonstrated that they result in head-to-head matching of the data that are both continuous and physically reasonable. We also discuss several issues associated with energy binning as a means for constructing differential flux images and present a powerful and robust approach that solves several critical problems ...

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