First Stereoscopic Views of the Ring Current From TWINS Energetic Neutral Atoms Imagers

Details First Stereoscopic Views of the Ring Current From TWINS Energetic Neutral Atoms Imagers First Stereoscopic Views of the Ring Current From TWINS Energetic Neutral Atoms Imagers

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm71a..02b&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SM71A-02

Physics

2778 Ring Current, 2794 Instruments And Techniques, 7845 Particle Acceleration, 7954 Magnetic Storms (2788), 7959 Models

Scientific paper

The TWINS (Two Wide-Angle Imaging Neutral-atom Spectrometers) mission is the first mission dedicated to obtaining stereoscopic views of the terrestrial ring current. Two identical instruments onboard two spacecraft measure 1-100 keV ENAs with high angular and time resolution simultaneously from two different vantage points. Despite a generally low level of geomagnetic activity during year 2008, TWINS captured stereoscopic images of the ring current during moderate storms of June 15 2008 and October 11 2008. We use the O/H ratio from TWINS data for these two modest storms to estimate the O+/H+ ratio, which is used as the outer boundary condition for the Comprehensive Ring Current Model (CRCM). We model 3D H+ and O+ fluxes for these storms and reconstruct H and O ENA images. As ENA fluxes were relatively small for those periods, we use the modeled results as a guide to interpret ENA data and derive the time-dependent, 3D structure of ring current during geomagnetic storms near the minimum of solar activity cycle.

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