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Proceedings Paper

Terrestrial magnetospheric imaging: numerical modeling of low-energy neutral atoms
Author(s): Kurt R. Moore; Herbert O. Funsten; David J. McComas; Earl E. Scime; Michelle F. Thomsen
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Paper Abstract

Imaging of the terrestrial magnetosphere can be performed by detection of low energy neutral atoms (LENAs) that are produced by charge exchange between magnetospheric plasma ions and cold neutral atoms of the Earth's geocorona. As a result of recent instrumentation advances it is now feasible to make energy-resolved measurements of LENAs from less than 1 keV to greater than 30 keV. To model expected LENA fluxes at a spacecraft, we initially used a simplistic, spherically symmetric magnetospheric plasma model. We now present improved calculations of both hydrogen and oxygen line-of-sight LENA fluxes expected on orbit for various plasma regimes as predicted by the Rice University Magnetospheric Specification Model. We also estimate expected image count rates based on realistic instrument geometric factors, energy passbands, and image accumulation intervals. The results indicate that presently proposed LENA instruments are capable of imaging of storm time ring current and potentially even quiet time ring current fluxes, and that phenomena such as ion injections from the tail and subsequent drifts toward the dayside magnetopause may also be deduced.

Paper Details

Date Published: 7 July 1993
PDF: 12 pages
Proc. SPIE 2008, Instrumentation for Magnetospheric Imagery II, (7 July 1993); doi: 10.1117/12.147641
Show Author Affiliations
Kurt R. Moore, Los Alamos National Lab. (United States)
Herbert O. Funsten, Los Alamos National Lab. (United States)
David J. McComas, Los Alamos National Lab. (United States)
Earl E. Scime, Los Alamos National Lab. (United States)
Michelle F. Thomsen, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 2008:
Instrumentation for Magnetospheric Imagery II
Supriya Chakrabarti, Editor(s)

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