TWINS Observations of Anisotropic ENA Emissions from Trapped and Precipitating Ions

Details TWINS Observations of Anisotropic ENA Emissions from Trapped and Precipitating Ions TWINS Observations of Anisotropic ENA Emissions from Trapped and Precipitating Ions

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm22b..04g&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM22B-04

Physics

[2716] Magnetospheric Physics / Energetic Particles: Precipitating, [2730] Magnetospheric Physics / Magnetosphere: Inner, [2778] Magnetospheric Physics / Ring Current, [2788] Magnetospheric Physics / Magnetic Storms And Substorms

Scientific paper

The Two Wide-angle Imaging Neutral-atom Spectrometers (TWINS) mission is the first stereo magnetospheric imager. In operation since June 2008, the TWINS observatory consists of two spacecraft on Molniya orbits that are widely separated in magnetic local time (MLT), providing different vantages to measure the energetic neutral atoms (ENAs) produced by charge exchange between exospheric neutral hydrogen and terrestrial ring current ions. ENAs can retain the pitch angle information of the parent ion population, so spatial anisotropy in ENA emissions can provide a remote measure of ion pitch angles. By providing two simultaneous observations of ENA intensity, from two different vantage points, TWINS measures the anisotropy in ENA emissions that can be used to infer pitch angle information. For several storm intervals including the recent 6 April 2010 (Tartan Day) storm, ENA signatures of both trapped and precipitating ions are analyzed. The TWINS-observed spatial dependence of ENA intensity is characterized in terms of the viewing geometry relative to the magnetic field in the ENA source region. This characterization is compared to forward-modeling analysis to determine the relationship between the ENA emission anisotropy and the global pitch angle distribution of the parent ions (both trapped and precipitating).

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