Terrestrial magnetospheric imaging: numerical modeling of low-energy neutral atoms

Kurt R. Moore; Herbert O. Funsten; David J. McComas; Earl E. Scime; Michelle F. Thomsen

doi:10.1117/12.147641

7 July 1993 Terrestrial magnetospheric imaging: numerical modeling of low-energy neutral atoms

Kurt R. Moore, Herbert O. Funsten, David J. McComas, Earl E. Scime, Michelle F. Thomsen

Proceedings Volume 2008, Instrumentation for Magnetospheric Imagery II; (1993) https://doi.org/10.1117/12.147641
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

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.

Citation Download Citation

Kurt R. Moore, Herbert O. Funsten, David J. McComas, Earl E. Scime, and Michelle F. Thomsen "Terrestrial magnetospheric imaging: numerical modeling of low-energy neutral atoms", Proc. SPIE 2008, Instrumentation for Magnetospheric Imagery II, (7 July 1993); https://doi.org/10.1117/12.147641

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KEYWORDS

Ions

Plasma

Hydrogen

Chemical species

Space operations

Magnetism

Magnetosphere

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