Composition of the ENA low altitude emissions as viewed by TWINS

Details Composition of the ENA low altitude emissions as viewed by TWINS Composition of the ENA low altitude emissions as viewed by TWINS

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm72a..03v&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SM72A-03

Physics

2716 Energetic Particles: Precipitating, 2730 Magnetosphere: Inner

Scientific paper

The Two Wide-angle Imaging Neutral-atom Spectrometers (TWINS) instruments consistently view bright ENA emission coming from low altitude (<500 km altitude). These low altitude emissions are typically the most intense ENA signal seen in the TWINS ENA energy range (~1keV to 100keV), especially during quiet times. The relative composition of the incident ENA's are determined by measuring the relative yield of secondary electrons liberated from the ultra-thin carbon foil as the ENA passes through the TWINS sensors. While this technique cannot determine the exact species on a particle per particle basis, it can statistically determine the ratio of heavy to light ENA's (O and H). We present the composition of the low altitude emission as a function of energy and local time for several events.

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