Experimental study of exospheric hydrogen atom distributions by Lyman-alpha detectors on the TWINS mission

Details Experimental study of exospheric hydrogen atom distributions by Lyman-alpha detectors on the TWINS mission Experimental study of exospheric hydrogen atom distributions by Lyman-alpha detectors on the TWINS mission

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11609302b&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A9, CiteID A09302

Physics

Atmospheric Composition And Structure: Exosphere, Atmospheric Composition And Structure: Instruments And Techniques, Magnetospheric Physics: Instruments And Techniques

Scientific paper

Exospheric atomic hydrogen (H) resonantly scatters solar Lyman-α (121.567 nm) radiation, observed as the geocorona. Measurements of scattered solar photons allow one to probe time-varying three-dimensional distributions of exospheric H atoms. The Two Wide-angle Imaging Neutral-atom Spectrometers (TWINS) mission images the magnetosphere in energetic neutral atom (ENA) fluxes and additionally carries Lyman-α detectors (LADs) to investigate exospheric atomic hydrogen. Knowledge of exospheric properties is essential for the interpretation of magnetospheric images in ENA fluxes produced in charge exchange between energetic ions and H atoms. We describe the process of obtaining exospheric distributions and present, as an example, a global H number density distribution for 11 June 2008. The TWINS LAD experimental data are especially sensitive to atomic hydrogen at geocentric distances from 3 to 8 Earth radii. The distribution reveals asymmetries from day to night, dawn to dusk, and north to south. We discuss the available data sets and their coverage, limitations, and promise for a study of exospheric response to seasonal, solar, and geomagnetic variations.

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