Monitoring of the Geocoronal Hydrogen Distribution with TWINS-1/2 Lyman-alpha Observations

Details Monitoring of the Geocoronal Hydrogen Distribution with TWINS-1/2 Lyman-alpha Observations Monitoring of the Geocoronal Hydrogen Distribution with TWINS-1/2 Lyman-alpha Observations

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm71a..05z&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SM71A-05

Physics

2431 Ionosphere/Magnetosphere Interactions (2736), 2778 Ring Current, 2788 Magnetic Storms And Substorms (7954)

Scientific paper

Two satellites, TWINS-1 and TWINS-2, are presently orbiting the Earth on highly elliptic high-apogee orbits. In addition to energetic neutral atom (ENA) imagers, both satellites carry Lyman-alpha detectors (LAD). These broadband photon-counting sensors measure the line-of-sight integrated Lyman-alpha (121.6 nm) flux of solar photons resonantly scattered by exospheric hydrogen atoms. The primary goal of the LAD measurements is characterization of the asymmetric geocorona and determining the global distribution of atomic hydrogen in the near-Earth region. Charge exchange collisions of energetic ions on these background hydrogen atoms produce ENAs detected by the TWINS ENA imagers. The hydrogen geocorona is optically thin at distances larger than 3 Earth radii, with the measured photon intensities directly related to the line-of-sight column densities of exospheric atomic hydrogen. The observational geometry limits the relative contribution of the interplanetary hydrogen glow, which can be reliably quantified and subtracted. We describe the LAD sensor in detail and present first results.

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